Creating two copies of a card like Combustible Gearhulk, Myr Battlesphere, or Ichor Wellspring, even for a single turn, can be a game-changer
If this card is sent from the field to the GY: You can add 1 "Red-Eyes" card from your Deck to your hand
If noncombat damage dealt by a source you control is being divided or assigned among multiple players, divide the original amount before adding 2
Her innate abilities utilize a mechanic that was first introduced in the original run of The Innsmouth Conspiracy cycle: bless tokens
If youre the monarch, their effect is so much better than when youre not, but when youre getting so many triggers even when youre not the monarch, its worth it
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