"Eighth Edition", +"can't attack", +!defender, +!detain, +!"you may change" (4)
Creatures with power greater than the number of cards in your hand can't attack.
Okk can't attack unless a creature with greater power also attacks.
Okk can't block unless a creature with greater power also blocks.
Enchant creature
Enchanted creature can't attack or block.
Sea Monster can't attack unless defending player controls an Island.
Gatherer works better in the Companion app!