Spirit Gate

At the beginning of your end step, put a curse
counter on target permanent.

Artifacts and enchantments with cure counters on
them are 2/2 spirits in addition to their other types.
Creatures with curse counters have +1/+1 ,
trample, and can't attack you. Planeswalkers have
"< 0 > : Add or remove a loyalty counter from each
planeswalker. Lands have "Add one mana of any
color."