pokemon sword and shield champion's path booster box or playing Pokemon Sword & Shield Champion's

Special Summon from your Extra Deck, 1 "The Phantom Knights", "Raidraptor", or "Xyz Dragon" Xyz Monster that is 1 Rank higher or lower than this card, by using this face-up card you control as material, but destroy it during your opponent's next End Phase (this is treated as an Xyz Summon, transfer this card's materials)

There are exceptions to this depending on the meta at the time and the format youre talking about, but four mana really seems to be the sweet spot

Safe Spot : Cool, dry, dark no direct sun/bends

This card absolutely has competitive appeal and the restriction is well worth working around where possible

Honest buybacks: Offers tied to live comps, not invented numbers

Really neat, flexible counters and an outlet for all this energy is really solid, 2 mana for that is a just solid enabler for a mechanics based deck