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Astral Titan (Primeval Titan) lives up to the hype and is a fantastic addition to any green archetype

Callous Dismissal gives us a way to bounce something like Teferi, Time Raveler back to our opponent's hand, and then, in theory, we can counter it when our opponent tries to recast it

By using Olivia as a commander, it gives this archetype an end game of sorts by having a great mana sink ability to put the game away

If the last target of Burn Together is an illegal target as the spell resolves but the first target is still legal, Burn Together will still resolve and you'll still sacrifice the first target

This does benefit from aggression, but Id play it anytime I could reasonably cast it