Darksteel Citadel

Destroy target nonwhite permanent.

Flying This creature enters with three +1/+1 counters on it. Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat.

Flying Reinforce 2—2W (2W, Discard this card: Put two +1/+1 counters on target creature.)

When you control no other artifacts, sacrifice this creature.

(T: Add W.)

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for 1 or one mana of that creature's color.) When this creature enters, you gain 1 life for each creature you control.

Target permanent you control gains protection from artifacts or from the color of your choice until end of turn.

+1: Create a 1/1 white Soldier creature token. +1: Target creature gets +3/+3 and gains flying until end of turn. −8: You get an emblem with "Artifacts, creatures, enchantments, and lands you control have indestructible."