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Sacrifice a Treasure: Exile the top card of your library

In addition to your main decklist, these formats allow a secondary list (almost always 15 cards maximum) that act sort of like substitute players in traditional team sports

Secondly, a lot of folks out there aren't comfortable with the idea of exiling stuff from their library

Trade-ins: Finally, some stores may offer trade-ins for your cards

Well, we dont have a single casting cost creature that produces a flying token on its way to the graveyard, but we do have [card]Blisterpod[/card], which leaves behind an Eldrazi Scion token that can ramp us to casting [card]Collected Company[/card]

(If a permanent with a stun counter would become untapped, remove one from it instead.) Whenever you tap an untapped creature an opponent controls, put a +1/+1 counter on target creature you control