As an additional cost to cast Æther Tide, discard X creature cards.

Return X target creatures to their owners' hands.

Apocalypse Hydra enters the battlefield with X +1/+1 counters on it. If X is 5 or more, it enters the battlefield with an additional X +1/+1 counters on it.

, Remove a +1/+1 counter from Apocalypse Hydra: Apocalypse Hydra deals 1 damage to target creature or player.

Aurelia's Fury deals X damage divided as you choose among any number of target creatures and/or players. Tap each creature dealt damage this way. Players dealt damage this way can't cast noncreature spells this turn.

Balduvian Hydra enters the battlefield with X +1/+0 counters on it.

Remove a +1/+0 counter from Balduvian Hydra: Prevent the next 1 damage that would be dealt to Balduvian Hydra this turn.

: Put a +1/+0 counter on Balduvian Hydra. Activate this ability only during your upkeep.

Banefire deals X damage to target creature or player.

If X is 5 or more, Banefire can't be countered by spells or abilities and the damage can't be prevented.

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

You may exile a red card with converted mana cost X from your hand rather than pay Blazing Shoal's mana cost.

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

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

Bonfire of the Damned deals X damage to target player and each creature he or she controls.

Miracle (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)

Target player draws X cards.

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.

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