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Part of the equation is what youre up against

She gains a loyalty counter to create a 1/1 creature token (which automatically becomes two), she adds a +1/+1 counter on all of your creatures AND gives them flying until your next turn (all for free), or she can sacrifice three loyalty counters to destroy a target creature of mana value three or greater

Its simple, break the cage or become the metal, saving you from a lot during a game of commander

In the popular Amethyst/Emerald deck it lets you pull off a nice little trick with The Queens Castle Mirror Chamber, as you can choose to move a character to castle first, then resolve the lore and draw

In combination with the draw, Cuchulainn can be seen as a 0 handcard investment (paying 2 handcards that are compensated by draw and keeping the character on board)