2 cards where the text includes “for each creature that player”

Canker Abomination (Ultimate Masters #212)

Canker Abomination {2}{B/G}{B/G}

Creature — Treefolk Horror

As Canker Abomination enters the battlefield, choose an opponent. Canker Abomination enters the battlefield with a -1/-1 counter on it for each creature that player controls.

Once the hideous disease takes hold, it spreads through both bark and mind.

6/6

Illustrated by Brandon Kitkouski

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Holga, Relentless Rager (Secret Lair Drop #1240)

Holga, Relentless Rager {4}{R}{R}

Legendary Creature — Human Barbarian

Haste

Holga, Relentless Rager must be blocked if able.

Whenever Holga attacks, each creature you control attacking a player gets +1/+0 until end of turn for each creature that player controls.

4/6

Illustrated by Yang Luo

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny

The message was clear to Sorin—time to search for something else.