Creature — Hydra
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When Bristling Hydra enters, you get
(three energy counters).
Pay
: Put a +1/+1 counter on Bristling Hydra. It gains hexproof until end of turn.
Some triggered abilities state that you "may pay" a certain amount of . You can't pay that amount multiple times to multiply the effect. You simply choose whether or not to pay that amount of as the ability resolves.