If heads, draw a card
However, its lower levels of annihilation (unless weakened) puts it at a meta position lower than not just the insane Mega Charizard Y EX, but also Mega Blaziken EX

All at instant speed Filter Out Returns all nonland, noncreature permanents to their owners hands (this does hit your permanents as well) Otawara, Soaring City This land is an auto-include in any deck with blue, if you have it Enters untapped The channel ability allows you to return an artifact, enchantment, creature or Planeswalker to its owners hand Stern Dismissal Returns an enchantment or creature you dont control to its owners hand Kioras Dismissal Return any number of enchantments to their owners hands Must pay an additional blue mana for each target beyond the first Chain of Vapor Return any nonland permanent to its owners hand Its controller can copy Chain of Vapor by sacrificing a land and chose any target for the copy This spell can continue to be copied so long as the conditions are met, potentially creating a chain of spells
It might be relevant that its a cheap artifact, but this is quite expensive and there are nearly no skeletons, spirits, or zombies for you to exile
One of mill's weaknesses is that you might enable your opponents' powerful graveyard strategies, so Ashiok, Dream Render alleviates that concern