If they have characters totalling 7 ink on board, they could sing Beyond the Horizon next turn to ruin your hand, so be ready
Destroying artifacts is always important in Commander
(Example: Tooth and Nail for Mike and Trike is GG for the table at instant speed, but T/N for Avenger and Hoof on an empty board only kills one person) This is a useful thing to talk about before a game, and really, thats the goal of these tiers and this entire process
The Obeka Factor Obeka is slightly different in that you can use her ability on any players turn, but that player may choose whether or not to end the turn
For example, even if we interpreted your library as part of the battlefield for this purpose, slipping one into the card sleeve of a card in your library during a search effectively marks your deck, and that's not allowed
Rarity: R #: 119 Card Type: Legendary Planeswalker Chandra Casting Cost: 2RR