yugioh legendary decks Yugi's Opening summon powerful Synchro Monsters Legendary Decks - Yugipedia

Sets That Contain Trainer Gallery Cards Dream League [SM11b]the only Gen 7 set with Trainer Gallery cards Skyscraping Perfection [S7D] / Blue Sky Stream [S7R] VMAX Climax [S8b] Battle Region [S9a] Dark Phantasma [S10a] Incandescent Arcana [S11a] Additionally, two Trainer Gallery cards were released as promotional cards while two others were part of the Ash vs Team Rocket Deck Kit [SMD]

+1: Until end of turn, Gideon becomes a 5/5 Human Soldier Ally creature with indestructible that's still a planeswalker

Presumably there was some tension here between wanting to show Mega Darkrai in its regular form and the spooky eyeball form that turns it into a final boss

While 6 mana is a steep investment at sorcery speed, the utility here is massive for closing out board stalls