Spooky20

Whenever an opponent casts a spell, Kaervek the Merciless deals damage equal to that spell's mana value to any target.

Vigilance {T}: Untap target attacking creature. Prevent all combat damage that would be dealt to and dealt by that creature this turn. Suspend 4—{W...

All Slivers have "When this permanent enters the battlefield, destroy target artifact or enchantment."

When Ivory Giant enters the battlefield, tap all nonwhite creatures. Suspend 5—{W} (Rather than cast this card from your hand, you may pay {W} and ...

Conflagrate deals X damage divided as you choose among any number of targets. Flashback—{R}{R}, Discard X cards. (You may cast this card from your ...

Echo {1}{R} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay ...

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

Flying, protection from black Suspend 3—{1}{W} (Rather than cast this card from your hand, you may pay {1}{W} and exile it with three time counters...

{2}{B}, {T}, Discard a card: Each other player loses 2 life. You gain life equal to the life lost this way.

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

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.) When Skulking Knight beco...

You gain 2 life for each creature target player controls. Suspend 5—{1}{W} (Rather than cast this card from your hand, you may pay {1}{W} and exile...

When you cast a creature spell, sacrifice Skittering Monstrosity.

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...

Destroy target nonblack creature. Madness {B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it...

When Cyclopean Giant dies, target land becomes a Swamp. Exile Cyclopean Giant.

{4}, {T}: Search your library for a Rebel permanent card with mana value 3 or less, put it onto the battlefield, then shuffle.

{T}: Add {C}. {1}{U}, {T}: Put target artifact card from your graveyard on top of your library.

Flash (You may cast this spell any time you could cast an instant.) Enchant creature Enchanted creature gets +1/+1, has reach, and can block creatu...

Defender This creature can block creatures with shadow as though they didn't have shadow. {R}: This creature gets +1/+0 until end of turn.

{4}, {T}: Search your library for a Rebel permanent card with mana value 3 or less, put it onto the battlefield, then shuffle.

This creature can't be blocked except by artifact creatures and/or white creatures.

Suspend 4—{U} (Rather than cast this card from your hand, pay {U} and exile it with four time counters on it. At the beginning of your upkeep, remo...

Destroy target artifact. Flashback {G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)