If your general doesn't provide any of those options, is trying to play burn in EDH a non-starter
Whenever you cast a colorless spell with mana value 7 or greater, you may exile this card from your graveyard
As for artifacts to cheat, Spine of Ish Sah is a classic, but Portal to Phyrexia and God-Pharaoh's Statue do tons of work as well
MTG mill cards might not be the top choice for competitive Magic: The Gathering players, but they're a popular (and at times powerful) part of the Magic ecosystem
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(If a permanent with a stun counter would become untapped, remove one from it instead.) If you didn't control another Dinosaur when you declared Pugnacious Hammerskull as an attacker, it doesn't matter whether or not you control one as its ability resolves