Creating two copies of a card like Combustible Gearhulk, Myr Battlesphere, or Ichor Wellspring, even for a single turn, can be a game-changer
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
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
The next important step is to lower your eyes to the bottom of the card and there you will find the words "Edition 1"
If noncombat damage dealt by a source you control is being divided or assigned among multiple players, divide the original amount before adding 2
With enough mana you can poison someone for 4, and even protect it via regenerate