Jet Medallion

Black spells you cast cost {1} less to cast.

Avacyn's Pilgrim

Myrkul, Lord of Bones

As long as your life total is less than or equal to half your starting life total, Myrkul, Lord of Bones has indestructible.
Whenever another nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of that card, except it's an enchantment and loses all other card types.

Devoted Druid

{T}: Add {G}.
Put a -1/-1 counter on Devoted Druid: Untap Devoted Druid.

Pearl Medallion

White spells you cast cost {1} less to cast.

Emerald Medallion

Green spells you cast cost {1} less to cast.