To make sure you have enough Energy cards, try between 18 and 22 in your 60-card deck
But, do note that Toon World is still better than having neither card in your hand at the start of the Duel
The Level 3 "Burning Abyss" monsters destroy themselves if their controller controls a non-"Burning Abyss" monster, so the opponent might disrupt the player with cards/effects that give them monsters, such as "Ojama Trio", "Santa Claws", "Creature Swap", "Flying "C"", etc., although "Libic" and "Farfa" can help maneuver around such strategies
Its not really hard to see why
The other evolutions have three-energy-type attacks too, but they dont overlap in the same way, making them a bit tougher to play together