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The Non-Human Elephant Nightmare in the Room Mutate is one of the most complicated Magic mechanics Ive ever seen (this side of Morph)
This applies only to casting spells
Then, creatures with -1/-1 counters on them cant block
Making 2/2 tokens with vigilance at a rate of one token for three mana, two tokens for four mana, three tokens for five mana, etc is honestly quite good, allowing you play both offense and defense as well as put a bunch of material in play as the game goes on
The -2 ability is also useful for filling your graveyard if your strategy relies on that
