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Its a perfect nice guy counterspell, giving both you and the targeted player some fresh cards to make up for the lost spell

Cards like [card]Kappa Cannoneer[/card], [card]Wurmcoil Engine[/card], and copied threats from [card]Phyrexian Metamorph[/card] apply steady pressure, while extra-turn spells allow you to close the game without giving opponents a chance to recover

However, Rubinia Soulsinger has a nice activated ability

Nethroi, Apex Of Death can trigger this effect multiple times since green, black, and white generally have the cheapest mutate creatures, and Nethroi's ability triggers whenever it mutates, not just when it's cast

The short version