Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)Sliver spells you cast have cascade.
Whenever a Warrior attacks, you may have its controller create a 1/1 white Warrior creature token that's tapped and attacking.: Untap all attacking creatures. They gain trample, lifelink, and haste until end of turn. After this phase, there is an additional combat phase. Activate only during combat.
Will of the council — Starting with you, each player votes for a nonland permanent you don't control. Exile each permanent with the most votes or tied for most votes.
HasteZurgo Helmsmasher attacks each combat if able.During your turn, Zurgo Helmsmasher has indestructible.Whenever a creature dealt damage by Zurgo Helmsmasher this turn dies, put a +1/+1 counter on Zurgo Helmsmasher.
Whenever The Fifteenth Doctor enters or attacks, mill three cards. You may put an artifact card with mana value 2 or 3 from among them into your hand.The first nonartifact spell you cast each turn has improvise. (Your artifacts can help cast that spell. Each artifact you tap after you're done activating mana abilities pays for .)
Flying, Sacrifice Glen Elendra Archmage: Counter target noncreature spell.Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)
Until your next turn, your life total can't change and you gain protection from everything. All permanents you control phase out. (While they're phased out, they're treated as though they don't exist. They phase in before you untap during your untap step.)Exile Teferi's Protection.
Destroy target creature if it has mana value 2 or less.Revolt — Destroy that creature if it has mana value 4 or less instead if a permanent left the battlefield under your control this turn.
: Search your library for a Sliver card, reveal that card, put it into your hand, then shuffle.: Gain control of target Sliver. (This effect lasts indefinitely.)
Whenever another creature you control dies, you get an experience counter.At the beginning of your end step, choose target creature card in your graveyard. If that card's mana value is less than or equal to the number of experience counters you have, return it to the battlefield. Otherwise, put it into your hand.