With the third card Quicksilver, Brash Blur a new mechanic called Power-Up was introduced that functions a bit like Exhaust in that it buffs the creature but can only be used once
Card Sets So far there have been two Lorcana card sets released, with more on the way
Leonardo, Sewer Samurai | 3 Colorless Mana, 1 White Mana Legendary Creature Mutant Ninja Turtle Samurai Sneak 2 Colorless Mana, 2 White Mana (You may cast this spell for 2 Colorless Mana and 2 White Mana if you also return an unblocked attacker you control to hand during the declare blockers step
While this is fine as long as it least one opponent doesn't have anything that can block a 4/4, as the game goes along and the board gets cluttered, it's going to be harder and harder to make Kalamax, the Stormsire into anything but an underpowered creature
Final Fantasy is introducing an entire cycle of artifact cards that look quite powerful in Commander, some of which have some powerful replacement effects for focused strategies