base set unlimited pokemon cards (20.96g) Booster Pack Grass Ability Energy Trans As often as you like during your turn (before your attack) Pokemon - WOTC - Base

As an aside, couldnt Duneblast have been a more flavorful representation

Split cards have both their sides names, their mana value is the sum of both sides mana values, and their colors are the sum of all their sides' colors everywhere other than the stack

Japanese Pokemon Booster MEGA Expansion Pokemon TCG Pre-Order Storm Emeralda Japanese Storm Emeralda Pre-Order: The Complete Buyer's Guide to the New MEGA Pokemon Booster By PokeNinJapan A complete buyer's guide to the Japanese Storm Emeralda (M6) MEGA expansion pack, covering release details, key cards, and how to secure a pre-order before it sells out

The back face of a transforming double-faced permanent has no mana cost