yugioh sora deck Complete Custom for Yu-Gi-Oh! ARC-V Sora Shiunin (DY) - Yugipedia

Although a Level 4 in a deck revolving around Level 7 Xyz monsters, Riseheart is easily special summoned when another Kashtira is on the field - a condition easily achieved with searchers like the new field spell Pressured Planet Wraitsoth, which can call either Unicorn or Fenrir who can be special summoned provided you control no monsters

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Further Reading: Cards Rising in the Post-Nadu Modern How Has the Print Change for Secret Lair Affected Prices So Far?

This gives it some advantages compared to both of its counterparts, since you're not capped at only a single copy, and playing it doesn't use up your single chance to play a supporter in a turn

Legacy This tournament paved the way for the Charizard Mega Battles that were held later in the same year

Subterranean Tremors works best in Gruul decks that ramp through sorceries like Rampant Growth