Withstand Death

Target creature gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it. If its toughness is 0 or less, it's still put into its owner's graveyard.)

Inspiring Unicorn

Whenever Inspiring Unicorn attacks, creatures you control get +1/+1 until end of turn.

Pegasus Courser

Flying
Whenever Pegasus Courser attacks, another target attacking creature gains flying until end of turn.

Prized Unicorn

All creatures able to block Prized Unicorn do so.

Wildwood Rebirth

Return target creature card from your graveyard to your hand.

Selesnya Guildgate

This land enters tapped.
{T}: Add {G} or {W}.

Forest

Candlelight Vigil

Enchant creature
Enchanted creature gets +3/+2 and has vigilance.

Plains

Pearled Unicorn

Mortal's Resolve

Target creature gets +1/+1 and gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Zebra Unicorn

Whenever Zebra Unicorn deals damage, you gain that much life.

Behemoth Sledge

Equipped creature gets +2/+2 and has trample and lifelink.
Equip {3}

Regeneration

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
{G}: Regenerate enchanted creature. (The next time that creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Mesa Unicorn

Lifelink (Damage dealt by this creature also causes you to gain that much life.)