During the WRGP duels, if a player uses a card that changes control of a Monster for only one turn, it will stay on the player's field for the rest of the continued duels if the player defeats their opponent on the same turn
There is a ton of support ripe for the picking
C Common Salamangreat Roar X TRAP Counter When a Spell/Trap Card, or monster effect, is activated while you control a "Salamangreat" Link Monster: Negate the activation, and if you do, destroy that card
The deck has plenty of strong low-level monsters, and you can use Ultra Evolution Pill, Spacetime Transcendence and Hunting Instinct to play your high-level monsters quickly
The Ancient Treasure monsters can also change themselves into Defense Position, preventing the player from taking battle damage