Coral Reef

This enchantment enters with four polyp counters on it. Sacrifice an Island: Put two polyp counters on this enchantment. {U}, Tap an untapped blue creature you control, Remove a polyp counter from this enchantment: Put a +0/+1 counter on target creature.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o9dmt64tdpb1h31vo513l.