If adding a single red mana one time for free is too good for Modern, then cards that repeatedly offer free mana (Chrome Mox, Eye of Ugin, and Mox Opal) or offer a one-time burst of more than one mana (Seething Song and Summer Bloom, which was primarily used as a ritual with bounce lands in Amulet of Vigor decks) are too good as well
As much as the change makes sense from a gameplay perspective, and even if it doesn't impact the storytelling of Tarkir: Dragonstorm or Edge of Eternities too much, if at all, it doesn't help the case WotC is making for more UB sets that also happen to be Standard-legal moving forward
Whether you grew up collecting Pokmon cards, watched the TV show each Saturday morning, or today you're just trying to make your kids happy because they're super into it, this current boom of Pokmon cards has even surpassed the original 90s "Pokemania"
But at times like these, it's hard to get what you want
The breakout potential here is quite high
Rather than just offering this troublesome trio of abilities once, Rankle pops off every time they attack