If an opponent cast a blue spell this turn, you may pay rather than pay this spell's mana cost.
Change the target of target spell with a single target.

Destroy target land, then Roiling Terrain deals damage to that land's controller equal to the number of land cards in that player's graveyard.

, : Exile target land you control, then return it to the battlefield under your control.

Whenever you cast a kicked spell, you may have Rumbling Aftershocks deal damage to any target equal to the number of times that spell was kicked.

Ruthless Cullblade gets +2/+1 as long as an opponent has 10 or less life.

: Exile the top card of target player's library. If it's a land card, you gain 1 life.
Landfall — Whenever a land enters the battlefield under your control, you may untap Scrib Nibblers.

Searing Blaze deals 1 damage to target player or planeswalker and 1 damage to target creature that player or that planeswalker's controller controls.
Landfall — If you had a land enter the battlefield under your control this turn, Searing Blaze deals 3 damage to that player or planeswalker and 3 damage to that creature instead.

Landfall — Whenever a land enters the battlefield under your control, you may pay . If you do, draw a card.

As long as you control a Plains, Sejiri Merfolk has first strike and lifelink. (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)

Sejiri Steppe enters the battlefield tapped.
When Sejiri Steppe enters the battlefield, target creature you control gains protection from the color of your choice until end of turn.
: Add .

Search your library for any number of nonland cards and exile them. Then shuffle your library.

Whenever Shoreline Salvager deals combat damage to a player, if you control an Island, you may draw a card.

Multikicker (You may pay an additional any number of times as you cast this spell.)
Haste
Skitter of Lizards enters the battlefield with a +1/+1 counter on it for each time it was kicked.

Whenever Slavering Nulls deals combat damage to a player, if you control a Swamp, you may have that player discard a card.

If a black creature with flying is attacking, you may pay rather than pay this spell's mana cost.
Destroy target attacking creature with flying.

Smoldering Spires enters the battlefield tapped.
When Smoldering Spires enters the battlefield, target creature can't block this turn.
: Add .

Destroy target creature with converted mana cost 3 or less. It can't be regenerated.

Landfall — Whenever a land enters the battlefield under your control, Snapping Creeper gains vigilance until end of turn.

Multikicker (You may pay an additional any number of times as you cast this spell.)
Counter target spell unless its controller pays . Draw a card for each time Spell Contortion was kicked.

Stirring Wildwood enters the battlefield tapped.
: Add or .
: Until end of turn, Stirring Wildwood becomes a 3/4 green and white Elemental creature with reach. It's still a land.