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Given that Merfolk go wide with creatures, a free counter spell at the cost of one lowly Merfolk can be game-saving and/or game-winning

The alternate commander Shalai and Hallar is also powerful, especially if you can spread counters easily

Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.) Casting a card by using its retrace ability works just like casting any other spell, with two exceptions: You're casting it from your graveyard rather than your hand, and you must discard a land card in addition to any other costs

These two starters appear to be coming as Wonder Picks based on the promo logo on them

Weakness / Resistance / Retreat Cost: P / None / 2

Maybe not a game-ending spell for Standard or limited play, but in Commander