yugioh spell ruler booster box Yu-Gi-Oh! TCG: (25th) With additional Effect and Fusion Monster cards Yu-Gi-Oh! Spell Ruler 25th Anniversary

The flexibility of being able to choose a value for X is great because we might have an early-game case of wanting (or needing) to cast it for X of one or two, or we can wait until late-game and sweep a much bigger battlefield

They are some of the most powerful cards available in the game

I didn't think that was true

At the beginning of your upkeep, put target creature card from a graveyard onto the battlefield under your control

For context, Hop's Zacian-ex from the sought after Japanese Battle Partners and English Journey Together set has an attack that does 240 damage, and with this Tool alone it can now one-hit knockout a ton of meta-game threats that it faces, such as Bloodmoon Ursaluna-ex

That makes them incredibly sought-after