Both have their pros and cons, but Id ultimately choose the latter as its easier to spend mana on Castle Vantress than to rely on having a legendary creature on your side of the field to activate Rivendells ability
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But if you like brutality, this comes very close
Buneary (Promo-B 19 / P-B) card How to get: Was obtained from Chansey and Bonus Wonder Picks running until January 19, 2026
Once you have, say, 500 coin flip activations on the stack, pass priority and let them resolve
However, its effect is good enough to provide an extra annoyance for the opponent to deal with