'Cannot be countered' Spells & Effects: Vexing Shusher and Boseiju, Who Shelter's All are the best way to push through Erayo as she effectively does nothing with these two on the board
Even Basic Grass-types offer a way to cut through the competition or even hold your opponents Pokemon down while you chip away at their health
Jarvis mentioned during a press briefing that the MTG design team focused on expressing new characters through a known Magic vocabulary, meaning they didnt want to fabricate fanciful new abilities on a lark
(Some Energy Cards may not be set/era specific)
There are a couple cool cards that arent dragons, too: Sidisi can always sacrifice herself, so you are never worse off than getting a tutor effect
The obvious choices for this style deck is any artifact that costs zero mana, like Lotus Petal, Mishras Bauble, and Lions Eye Diamond