3 Secrets of Eternity Booster Packs
If you choose to pay the impending cost of a creature spell, it's still a creature spell on the stack
At worst, this is usually a three-for-one, countering a spell, drawing a card, and bouncing a troublesome permanent thats shown up by the time you have 6 mana
When you activate a card with a Requirement along the lines of [Requirement] You can activate this by placing 1 card from your Graveyard on the bottom of the Deck, can your turn a Fusion Monster back into the Extra Deck to activate it
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At the beginning of your end step, mill two cards, then exile a nonland card at random from your graveyard