Its not especially fancy, but the mix of abilities is good enough to make it excellent on turn four - or a fine topdeck later on in the game, too
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[2] There are two popular precon types: Challenger Decks and Commander Decks
Just remember that umbra armor won't help if the creature's toughness is 0 or less, if it's being sacrificed, or if it's trying to leave the battlefield in any way other than by being destroyed
As an added boost to an already terrifying card, any time a ninja, turtle, and/or mutant deals combat damage to a player, that creature gets a +1/+1 counter