Luckily, that's not all it has to offer, since its effect is quite incredible, a staple for Ice Barrier Synchros
Greninja can be used to lend extra damage to your main attacker, counteracting potions, and making it easier to finish off a 'mon
But that's still inefficient, because you have to discard a card
Nissa's Revival will ramp the mana base into the late game and gain life, and Veinwitch Coven will use this lifegain to pay B and get a creature from the graveyard to the hand
If the discarded card was a Zombie card, create a tapped 2/2 black Zombie creature token
This trio is notable for their unique evolutionary lines tied to elemental stones, requiring a Leaf Stone for Simisage's evolution from Pansage