Unification of the Cubic Lords is your only way to summon Crimson Nova Trinity the Dark Cubic Lord , but you mainly use this card's second effect: if a Cubic monster you control is destroyed or leaves the field, you can banish this card from the Graveyard to summon any level 4 or lower Cubic monster from your hand or deck ignoring the summoning condition
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So if the birthday boy/girl suggests the game, watch out
Everything that follows is just my opinion, but I at least did some research for you first
You must do so even if it requires targets and the only legal targets are ones that you really dont want to target