yugioh return to hand cards Yu-Gi-Oh! - Card of Safe (HL07-EN005) - Hobby League Season 7 - Promo Edition Return 1 of your monsters that is sent to your Graveyard during this turn as a result of battle to your hand at the end of this turn. Painful Return | Yu-Gi-Oh! Wiki

But mass untappers where you have to jump through hoops (like paying mana or recurring a trigger) are still viable, so long as the creatures youre untapping can generate the right mana or other effects to repeat the loop

C Common Cyberse Desavewurm X DARK Level 6 [ CyberseFusionEffect ] ATK 2300 DEF 1500 1 Cyberse Ritual, Fusion, Synchro, Xyz, or Link Monster + 1 Cyberse monster During your Main Phase: You can Special Summon 1 Cyberse monster from your hand, then you can make this card's Level become the same as that monster

Black Star Promo 6 - Arcanine (Pokmon League (March 2000))

You can take the expensive spell approach where you're hoping to cascade high mana value spells into other expensive spells