Two immediate options that come to mind are Jodah, Archmage Eternal, which basically lets you cast this for WUBRG and then net yourself 5 mana to help cast the spells you reveal, and Mizzix of the Izmagnus, which can cast this 10cmc spell for as low as RRR
For example, let's say you open Avaricious Dragon in pack two
You can also swap out some of the Trainer Cards to complete the deck a bit easier
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When it enters the battlefield under your control, if an opponent controls more lands than you, you can search up a basic Plains and put it onto the battlefield tapped
Sauron, the Necromancer Sauron, the Necromancer is a powerful commander that benefits from staying on offense