Awesome Cyber Monday

At the beginning of your upkeep, put a spore counter on Deathspore Thallid. Remove three spore counters from Deathspore Thallid: Create a 1/1 green...

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.) Return target per...

Flash (You may cast this spell any time you could cast an instant.) When Voidmage Husher enters the battlefield, counter target activated ability. ...

All Slivers have "{T}: Target player puts the top card of their library into their graveyard."

All Sliver creatures have "{T}: This creature deals 2 damage to any target and 3 damage to itself."

Shadow (This creature can block or be blocked by only creatures with shadow.) Whenever Looter il-Kor deals damage to an opponent, draw a card, then...

Morph {5}{U}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) When Brine Elemental is ...

Exile target artifact or enchantment. If you cast this spell during your main phase, you may exile up to one other target artifact or enchantment.

Suspend 6—{W} (Rather than cast this card from your hand, pay {W} and exile it with six time counters on it. At the beginning of your upkeep, remov...

{T}: Add {C}. {1}, {T}: Put a storage counter on Calciform Pools. {1}, Remove X storage counters from Calciform Pools: Add X mana in any combinatio...

{T}: Add {C}. {1}, {T}: Add one mana of any color.

Spells you cast cost {1} less to cast for each card with the same name as that spell in your graveyard.

{T}: Choose target permanent you control or suspended card you own. If that permanent or card has a time counter on it, you may remove a time count...

Forestwalk (This creature can't be blocked as long as defending player controls a Forest.) When Yavimaya Dryad enters the battlefield, you may sear...

Flash (You may cast this spell any time you could cast an instant.) Flying, protection from blue Return a Forest you control to its owner's hand: U...

Destroy target land. Search your library for a Forest card and put that card onto the battlefield tapped. Then shuffle your library.

Target creature gets +2/+2 until end of turn. If you cast this spell during your main phase, that creature gets +4/+4 until end of turn instead.

All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it." (The damage is dealt before the counter is put on.)

Destroy target land. Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.)

As an additional cost to cast this spell, discard a card or pay {5}. Lightning Axe deals 5 damage to target creature.

All Sliver creatures get +2/+0.

All Sliver creatures have "Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature."

Each player loses 1 life, discards a card, sacrifices a creature, then sacrifices a land.

All Slivers have "{1}, Sacrifice this permanent: Each player discards a card."