#9 Aura Mutation Nothing is worse than having to spend a turn and a card to destroy a Rhystic Study or Smothering Tithe
If there's a cost associated with having it attack, the player isn't forced to pay that cost, so it doesn't have to attack in that case either
Legendary Creature Dinosaur Mutant Rare Miro Petrov 6/6 NOT LEGAL Standard NOT LEGAL Future NOT LEGAL Historic NOT LEGAL Timeless NOT LEGAL Gladiator NOT LEGAL Pioneer NOT LEGAL Explorer NOT LEGAL Modern LEGAL Legacy NOT LEGAL Pauper LEGAL Vintage NOT LEGAL Penny LEGAL Commander LEGAL Oathbreaker NOT LEGAL Standardbrawl NOT LEGAL Brawl NOT LEGAL Alchemy NOT LEGAL Pauper Commander LEGAL Duel NOT LEGAL Oldschool NOT LEGAL Premodern NOT LEGAL Predh As Indominus Rex, Alpha enters, discard any number of creature cards
The card is, however, extremely powerful
This might have had as much to do with cEDH play as its Legacy success, but it'll be interesting to see if, and how much, it slumps now
Will, Scholar of Frost offers a discount on your Instant and Sorceries with a bit of card draw thrown in for good measure