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There are plenty of other playables worth mentioning, but I found that cards like Teferi's Protection, Swords to Plowshares, and Ephemerate are so unbelievably good at doing what they do that the third or fourth next best option isnt really even worth mentioning

Legacy is Magics strongest Eternal format that still bans cards for power level reasons, and this 3-mana 3/3 is among that elite class of cards

If you have two non-Hydra creatures with Wildwood Scourge's ability (perhaps because they were mutated using the Ikoria: Lair of Behemoths mutate ability), putting a +1/+1 counter on any non-Hydra creature you control will cause the two abilities to trigger each other indefinitely

Then, it allows sources controlled by the owner that deal damage to an opponent or permanent to deal that much damage plus the number of fire counters of Fated Firepower, meaning that 3 counters would make a 1/1 creature deal 4 damage, instead

You can unlock that door even if there would be insufficient legal targets for that triggered ability