2022-06-10 To double a creature's power, that creature gets +X/+0, where X is that creature's power as the triggered ability resolves
In most cases it is better to continue playing to call their bluff because, if your opponent doesnt have a way to destroy Roots of Yggdrasil you can at least progress the game
Since decks that use the graveyard are equally useful, several decks, starting with Elemental Circulation, are receiving the mercy of angels arranged specifically for the theme
Dimir Murktide doesnt come out of the gate quite so fast, but it has so much removal and disruption that Esper Energy will likely struggle to find its footing
Its ability to mega evolve in later games such as Pokmon X and Y, where it becomes a Water/Dark type, only adds to its allure and strategic depth