Its as simple as sending your preferred attacker to the Active Spot and then using Mirage Gate, Energy Retrieval, and the needed Energy card you can attach to a Pokemon per turn to have your attacker with the needed Energy cards to attack
Deharme (5) Billy Christian (3) Borja Pindado (3) Brad Rigney (1) Bram Sels (7) Brom (3) Bryan Sola (4) Cabrol (3) Chase Stone (46) Chippy (2) Chris Rahn (47) Chris Rallis (74) Christopher Moeller (2) Chuck Lukacs (6) Clint Cearley (8) Clover.K (1) Cosmin Podar (5) Cristi Balanescu (9) Cynthia Sheppard (9) D-suzuki (1) D
Some might prefer it given you are casting from your graveyard loads too, but I prefer casting them twice if you draw them, once normally and once in flashback
fusion monster, Titania, Voice of Gaea requires another creature to become super powerful
(Enter the first room or advance to the next room.) Whenever Barrowin of Clan Undurr attacks, return up to one creature card with mana value 3 or less from your graveyard to the battlefield if you've completed a dungeon