Rotom

Tap target artifact you control: Rotom becomes
the color of the tapped artifact while it is tapped. Artifacts tapped this way do not untap until this ability is used again.
If Rotom is white, it has "{t}: Target creature
cannot block this turn." If Rotom is blue, it has
"{t}: Scry 2." If Rotom is black, it has "{b}{t}:
Destroy target creature." If Rotom is red, it has "{t}: Deal 2 damage to target creature." If Rotom is green, it has "Creatures you control get +1/+1
for each land you control."