Singer of Swift Rivers
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急流の歌い手 (Singer of Swift Rivers) (ja)

Creature - Merfolk Shaman | Power/Toughness: 3 / 2 (CMC 3)
Flash
When Singer of Swift Rivers enters the battlefield, put a shield counter on another target creature you control. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)
You may cast Merfolk spells as though they had flash.