You'll be slinging spells, sure, but Rootha creates flying Elementals with Haste and power/toughness equal to the highest mana value spell you cast in your first main phase
Contrast this with Merfolk Branchwalker, where both options are good: About 40% of the time its sort of a Silvergill Adept
This gives the impression that Pokmon, like people and pets, are just a common occurrence in the world
Lorwyn has been part of Magics locations since 2007, and there are some great cards in the set - including some that are already spiking in value
Similarly, if you sacrifice a creature to activate a mana ability while activating Heirloom Epic's ability, that creature won't be on the battlefield when you pay the ability's activation cost, so you won't be able to tap that creature rather than pay one of the mana in the activation cost
6 Flatline Flatline is a way to completely wipe away any threats your opponents may have on their sides of the field