Mirror Image

You may have Mirror Image enter as a copy of a creature you control.

Tactical Advantage

Target blocking or blocked creature you control gets +2/+2 until end of turn.

Aether Tunnel

Enchant creature
Enchanted creature gets +1/+0 and can't be blocked.

Plains

Leonin Vanguard

At the beginning of combat on your turn, if you control three or more creatures, this creature gets +1/+1 until end of turn and you gain 1 life.

Revitalize

Ajani's Welcome

Whenever a creature you control enters, you gain 1 life.

Wall of Runes

Defender (This creature can't attack.)
When Wall of Runes enters, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Tranquil Cove

This land enters tapped.
When this land enters, you gain 1 life.
{T}: Add {W} or {U}.

Island

Aegis of the Heavens

Target creature gets +1/+7 until end of turn.

Metamorphic Alteration

Enchant creature
As Metamorphic Alteration enters, choose a creature.
Enchanted creature is a copy of the chosen creature.

Hallowed Priest

Whenever you gain life, put a +1/+1 counter on Hallowed Priest.

Cloudkin Seer

Flying
When Cloudkin Seer enters, draw a card.

Shield Mare

Shield Mare can't be blocked by red creatures.
When Shield Mare enters or becomes the target of a spell or ability an opponent controls, you gain 3 life.