Plains

Minister of Impediments

({W/U} can be paid with either {W} or {U}.)
{T}: Tap target creature.

Senate Griffin

Flying
When Senate Griffin enters, scry 1.

Judge's Familiar

Flying
Sacrifice Judge's Familiar: Counter target instant or sorcery spell unless its controller pays {1}.

Augury Adept

Whenever Augury Adept deals combat damage to a player, reveal the top card of your library and put that card into your hand. You gain life equal to its mana value.

Steel of the Godhead

Enchant creature
As long as enchanted creature is white, it gets +1/+1 and has lifelink. (Damage dealt by the creature also causes its controller to gain that much life.)
As long as enchanted creature is blue, it gets +1/+1 and can't be blocked.

Repel the Darkness

Tap up to two target creatures.
Draw a card.

Secure the Scene

Exile target nonland permanent. Its controller creates a 1/1 white Soldier creature token.

Thriving Heath

Thriving Heath enters tapped. As it enters, choose a color other than white.
{T}: Add {W} or one mana of the chosen color.

Curse of Chains

Enchant creature
At the beginning of each upkeep, tap enchanted creature.

Mirror-Sigil Sergeant

Trample
At the beginning of your upkeep, if you control a blue permanent, you may create a token that's a copy of Mirror-Sigil Sergeant.

Somnomancer

When Somnomancer enters, you may tap target creature.

Wandering Champion

Whenever Wandering Champion deals combat damage to a player, if you control a blue or red permanent, you may discard a card. If you do, draw a card.