Chelcarain from the Brilliant Stars set and its ability " Sun-Drenched Shell "
Mewtwo & Mew GX (Unified Minds) Tag Team GX cards were one of the most popular, most creatively ambitious, and most collector-friendly mechanics ever introduced in the Pokemon TCG, combining two Pokemon on a single card with powerful combined attacks, elevated HP totals, and artwork that told a story about the relationship between the featured Pokemon
Furthermore, Yusei grew up without his biological family, while Yuma grew up with his grandmother and sister
While you control a "Gouki" Link Monster, this card cannot be destroyed by battle
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It really isn't that much of a sacrifice to add another color with all of the mana we'll be generating