Powerful cards like Dark Confidant, Bitterblossom, and others offer powerful upkeep triggers for Commander games
Primordial Hydra is an $8 card
Before the new Mega Charizard cards, the franchise is planning to drop the Mega Brave and Mega Symphonia sets first
If I recall correctly, this began in the core set with Garruk, Primal Hunter with a rough five-cost with triple Green, but then +1 to make a 3/3 Beast that's Green or -3 once to draw
That said, the Commander Bracket system is probably better than the informal power level rankings , or leaving it up to players to say whether their deck is "competitive" or not without any solid criteria
Over all Vastwood Seer is top range filler