Call the Skybreaker [Commander 2015] Bolas You can only use this

You can only use this effect of "Generaider Boss Room" once per turn

If you control an Urza's Power-Plant and an Urza's Tower

-From the Tales of the Noble Knights

Set: World Superstars Card type: Xyz/Effect Monster Rarity: Super Rare Attack: 2300 Defense: 1600 2 Level 4 monsters Once per turn: You can attach 1 "Battlin' Boxer" monster from your hand or Graveyard to this card as an Xyz Material

Lightning Overdrive also features the following:

Call the Skybreaker [Commander 2015] Bolas You can only use thisSet: Commander 2015 Type: Sorcery Rarity: Rare Cost: {5}{U R}{U R} Create a 5 5 blue and red Elemental creature token with flying. Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.) It hears and answers every orison across Shadowmoor.