Whenever you cast a red spell, if Runaway Steam-Kin has fewer than three +1/+1 counters on it, put a +1/+1 counter on Runaway Steam-Kin.
Remove three +1/+1 counters from Runaway Steam-Kin: Add .

(: Add or .)
As Sacred Foundry enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

Return X target creatures of the creature type of your choice to their owner's hand.

Selesnya Guildgate enters the battlefield tapped.
: Add or .

Selesnya Guildgate enters the battlefield tapped.
: Add or .

Selesnya Guildgate enters the battlefield tapped.
: Add or .

: Add or .
, , Sacrifice Selesnya Locket: Draw two cards.

As an additional cost to cast this spell, sacrifice a creature.
You gain life equal to the sacrificed creature's toughness. Destroy target creature an opponent controls.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)
Trample

, , Sacrifice Silent Dart: It deals 3 damage to target creature.

Counter target spell.
Surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Flying, haste

Whenever Skyline Scout attacks, you may pay . If you do, it gains flying until end of turn.

Whenever you cast an instant or sorcery spell, target creature an opponent controls can't block this turn.

Tap target creature. Sonic Assault deals 2 damage to that creature's controller.
Jump-start (You may cast this card from your graveyard by discarding a card in addition to paying its other costs. Then exile this card.)

When Spinal Centipede dies, put a +1/+1 counter on target creature you control.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)
Choose one —
• Create a 2/2 green and white Elf Knight creature token with vigilance.
• Destroy target artifact or enchantment.

Destroy target artifact, creature, or enchantment.

Target creature gets +1/+1 and gains deathtouch until end of turn.

(: Add or .)
As Steam Vents enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.