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(If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.) When this creature becomes monstrous, create X X/X green Hydra creature tokens

Being able to bring back a creature from your graveyard and back to your hand can be very helpful in drawn-out games, while the lifegain can keep you healthy in the face of your opponents

SR Super Rare UR Ultra Rare SE Secret Rare UL Ultimate Rare PS Platinum Secret Rare CR COLLECTOR'S RARE QCSE Quarter Century Secret Rare Super Polymerization X SPELL Quick-Play Discard 1 card

It comes down early (at least when you can set up ninjutsu) and then provides free card advantage so long as you can keep opposing blockers out of its way