Thunderblust

Creature - Elemental 7/2, 2RRR (5)
Haste
Thunderblust has trample as long as it has a -1/-1 counter on it.
Persist (When this creature is put into a graveyard from play, if it had no -1/-1 counters on it, return it to play under its owner's control with a -1/-1 counter on it.)¹
Illus. Dan Scott

Crystal Keep Rulings Summaries

• Whether or not it has trample only matters at the time damage is assigned. [Eventide FAQ 2008/07/08]
• Note - Also see Haste, Rule 502.5.
• Note - Also see Persist, Rule 502.79.
• Note - Also see Trample, Rule 502.9.

Format Legality	Legal in Vintage, Legacy, Extended, Standard
Printings (1/9)	Eventide (Rare)