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If you would rather not restrict your deckbuilding, Jegantha is also a solid card in the 99 of any 5 color deck playing a lot of 3+ color spells

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The ability that defines Avalanche of Sector 7's power applies in all zones, not just the battlefield

Alternatively, you can use bounce lands which auto-return to hand, and either make infinite kitties or grow your team arbitrarily big with Felidar Retreat, or just straight up murder everyone by exiling your library with Valakut Exploration

You receive two of each mana to help you cast five spells that have exactly three colors

Rakdos Cackler is a good start since that gives you a 3/3 and then 4/4, limiting potential answers, and Tormented Hero is another reasonable target