Flying, soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Breathkeeper Seraph is paired with another creature, each of those creatures has “When this creature dies, you may return it to the battlefield under its owner’s control at the beginning of your next upkeep.”

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Deadeye Navigator is paired with another creature, each of those creatures has “{1}{U}: Exile this creature, then return it to the battlefield under your control.”

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Diregraf Escort is paired with another creature, both creatures have protection from Zombies.

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

Whenever Donna or a creature it’s paired with is dealt damage, Donna deals that much damage to target opponent.

Doctor’s companion (You can have two commanders if the other is the Doctor.)

Reach

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Doom Weaver is paired with another creature, each of those creatures has “When this creature dies, draw cards equal to its power.”

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Druid’s Familiar is paired with another creature, each of those creatures gets +2/+2.

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Elgaud Shieldmate is paired with another creature, both creatures have hexproof. (They can’t be the targets of spells or abilities your opponents control.)

Flowering Lumberknot can’t attack or block unless it’s paired with a creature with soulbond.

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Galvanic Alchemist is paired with another creature, each of those creatures has “{2}{U}: Untap this creature.”

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Geist Trappers is paired with another creature, both creatures have reach.

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Hanweir Lancer is paired with another creature, both creatures have first strike.

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Imperious Mindbreaker is paired with another creature, each of those creatures has “Whenever this creature attacks, each opponent mills cards equal to its toughness.”

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Lightning Mauler is paired with another creature, both creatures have haste.

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Mirage Phalanx is paired with another creature, each of those creatures has “At the beginning of combat on your turn, create a token that’s a copy of this creature, except it has haste and loses soulbond. Exile it at end of combat.”

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Nearheath Pilgrim is paired with another creature, both creatures have lifelink.

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Nightshade Peddler is paired with another creature, both creatures have deathtouch.

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Pathbreaker Wurm is paired with another creature, both creatures have trample.

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Silverblade Paladin is paired with another creature, both creatures have double strike.

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Spectral Gateguards is paired with another creature, both creatures have vigilance.

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Stern Mentor is paired with another creature, each of those creatures has “{T}: Target player mills two cards.”