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
Other Fun Decks To Check Out The following might not be the most powerful, but Ive enjoyed playing with them
(Artifact, battle, creature, enchantment, instant, land, planeswalker, and sorcery are card types.) When Atraxa enters, reveal the top ten cards of your library
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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
Sword of Truth and Justice works particularly well here because it gives you +1/+1 counters and Proliferates