mtg.wtf

Improvise
Target creature gets -X/-X until end of turn. You gain X life.

Search your library for up to X battle cards with different names, put them onto the battlefield, then shuffle.

Benevolent Hydra enters the battlefield with X +1/+1 counters on it.
If one or more +1/+1 counters would be put on another creature you control, that many plus one +1/+1 counters are put on it instead.
{T}, Remove a +1/+1 counter from Benevolent Hydra: Put a +1/+1 counter on another target creature you control.

Put a random creature card with mana value X or less from target opponent's library onto the battlefield under your control. It perpetually has base power and toughness X/X and perpetually gains ward {1}.

Creatures you control have base power and toughness X/X until end of turn.

Up to one target creature gets -X/-X until end of turn. If X is 5 or more, return a creature card with mana value X or less from your graveyard to the battlefield tapped.

Put X -1/-1 counters on each creature. Shuffle Black Sun's Zenith into its owner's library.

When Bladecoil Serpent enters the battlefield, for each {U}{U} spent to cast it, draw a card.
When Bladecoil Serpent enters the battlefield, for each {B}{B} spent to cast it, each opponent discards a card.
When Bladecoil Serpent enters the battlefield, for each {R}{R} spent to cast it, it gets +1/+0 and gains trample and haste until end of turn.

Blaze deals X damage to any target.

You may exile a red card with mana value X from your hand rather than pay this spell's mana cost.
Target creature gets +X/+0 until end of turn.

Target creature gets +X/+0 until end of turn.

Create X tapped 2/1 white and black Inkling creature tokens with flying. If X is 6 or more, destroy all noncreature, nonland permanents.

Gain control of target creature with mana value X or less. If X is 5 or more, create a token that's a copy of that creature.

Target player draws X cards. Shuffle Blue Sun's Zenith into its owner's library.

As an additional cost to cast this spell, pay X life.
Each other player loses X life.

Bonfire of the Damned deals X damage to target player or planeswalker and each creature that player or that planeswalker's controller controls.
Miracle {X}{R}

Borrowing the East Wind deals X damage to each creature with horsemanship and each player.

Target player draws X cards.

Draw four cards, then choose X cards in your hand and discard the rest.

Briber's Purse enters the battlefield with X gem counters on it.
{1}, {T}, Remove a gem counter from Briber's Purse: Target creature can't attack or block this turn.

Radiance — Brightflame deals X damage to target creature and each other creature that shares a color with it. You gain life equal to the damage dealt this way.

Counter target spell unless its controller pays {X}. Clash with an opponent. If you win, that spell's controller mills four cards.

Ravenous
Brood Telepathy — When Broodlord enters the battlefield, distribute X +1/+1 counters among any number of other target creatures you control.

Destroy X target artifacts. Builder's Bane deals damage to each player equal to the number of artifacts they controlled that were put into a graveyard this way.

Burn from Within deals X damage to any target. If a creature is dealt damage this way, it loses indestructible until end of turn. If that creature would die this turn, exile it instead.