Aerith Gainsborough's second ability triggers just once for each life-gaining event, whether it's 1 life from Al Bhed Salvagers or 3 life from Balamb T-Rexaur
The fact of the matter is, a lot of Dinosaurs in Magic are pretty powerful and being able to cast them for just three mana feels broken
It's great for bouncing with the help of Kor Skyfisher and Glint Hawk, makes for good sacrificial fodder to Deadly Dispute, Kuldotha Rebirth, and Krark-Clan Shaman, and can even just be re-equipped if your creature dies
Thats because, in a highly thematic touch, Morph, Space Goo can use the Shift of any other characters
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Its got some large shoes to fill thanks to the legacy of the plane, as well as the rotation itself - and while it doesnt have to fill them entirely, it at least has to sell us some equally comfortable ones