Plains

Leonin Skyhunter

Wall of Glare

Defender (This creature can't attack.)
This creature can block any number of creatures.

Suntail Hawk

Leonin Den-Guard

As long as this creature is equipped, it gets +1/+1 and has vigilance.

Adventuring Gear

Landfall — Whenever a land you control enters, equipped creature gets +2/+2 until end of turn.
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

Chastise

Destroy target attacking creature. You gain life equal to its power.

Cloudreach Cavalry

As long as you control a Bird, this creature gets +2/+2 and has flying.

Pacifism

Enchant creature
Enchanted creature can't attack or block.

Skyhunter Prowler

Flying, vigilance (This creature can't be blocked except by creatures with flying or reach, and attacking doesn't cause this creature to tap.)

Battle Screech

Create two 1/1 white Bird creature tokens with flying.
Flashback—Tap three untapped white creatures you control. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Vulshok Morningstar

Equipped creature gets +2/+2.
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

Welkin Hawk

Flying
When this creature dies, you may search your library for a card named Welkin Hawk, reveal that card, put it into your hand, then shuffle.

Leonin Scimitar

Equipped creature gets +1/+1.
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)