Phyrexian Altar

Sacrifice a creature: Add one mana of any color.

Elesh Norn, Grand Cenobite

Vigilance
Other creatures you control get +2/+2.
Creatures your opponents control get -2/-2.

Bishop of Wings

Whenever an Angel you control enters, you gain 4 life.
Whenever an Angel you control dies, create a 1/1 white Spirit creature token with flying.

Kormus Bell

All Swamps are 1/1 black creatures that are still lands.

Linvala, Keeper of Silence

Flying
Activated abilities of creatures your opponents control can't be activated.

Urborg, Tomb of Yawgmoth

Each land is a Swamp in addition to its other land types.

Divine Visitation

If one or more creature tokens would be created under your control, that many 4/4 white Angel creature tokens with flying and vigilance are created instead.