Day/Night had done a good job of making it easy to remember what state the creatures were in, but everyone involved realized that it wasn't working
Shiko and Narset, Unified Shiko and Narset, Unified is easier to use than Flamehold Grappler
Furthermore, I think the fact that the card is expensive adds to the feeling that the game-warping card isn't something all players have access to
Bundle Bundles are ideal if you want some exciting bonuses to go with your booster packs
Legendary Planeswalker - Ajani Nikara, Lair Scavenger Partner with Yannik, Scavenging Sentinel (When this creature enters, target player may put Yannik into their hand from their library, then shuffle.) Menace Whenever another creature you control leaves the battlefield, if it had one or more counters on it, you draw a card and you lose 1 life
X = 3 is already amazing - you get 9 power for six mana across three Creatures - but dialing that up makes him absolutely nuts