The selection of oversized cards typically originates from specific product lines
If it changes zones, it will either cease to exist (if it's a token) or cease to be a copy (if it's a nontoken permanent), and so you won't be able to cast it as an Adventure
(If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.) You may cast this card from your graveyard using its blitz ability
By serving as a gameplay innovation that can also make it closer to other popular trading card games, they are a massive boon
In FF7, this creates an epic boss battle that can be somewhat difficult depending on how early on you take the fight in the original game, and how prepared you are in Rebirth
With 2/2/2/2 all-rounder stats, they can challenge when needed while keeping early lore pressure on