Beyond the most obvious useif youre using attacks that are boosted by the number of cards on the opponents benchif someone is leaving space for their vital Ralts to support their Mewtwo, or a Charmander that stubbornly wont come out to build their Charizard, filling that slot with whichever card they sacrificed up front would be extremely funny.
It works very well with discard-based mechanics like madness, cards like Hazoret the Fervent, or graveyard synergies
Roc Egg is one of four actual eggs legal for us to play, along with Rukh Egg, Dragon Egg and Summoner's Egg (sadly no Ludevic's Test Subject for us - it was errata'd to Lizard Egg because of reasons?)
BPhillipYork: Kind of funny, probably playable in Commander, but it's a stretch
Ive always liked Rafiq ever since I played with it when it was legal in Standard
Its not anything special unless youre consistently getting value each turn, so it is narrow