Due to containing guaranteed special cards, Collector Boosters are priced much higher than Play Boosters
If the counter is removed, the ability goes away
There is a lot to consider when you take the steps to build your first Magic: The Gathering cEDH deck, with the first of those choices being which commander you are going to play
Extra turns are obscene in EDH, but in most other formats, Ancestral Recall is probably better than Time Walk
The Aetherspark #496 First Place Foil Aetherdrift Change Version The Aetherspark Legendary Artifact Planeswalker Equipment As long as The Aetherspark is attached to a creature, The Aetherspark can't be attacked and has "Whenever equipped creature deals combat damage during your turn, put that many loyalty counters on The Aetherspark." +1: Attach The Aetherspark to up to one target creature you control
I can see a game state where a Black deck uses something like Deadly Cover-up to wipe the board, play this on the next turn to take down whatever creature your opponent used to recover, and then gets to untap and take out any remaining blockers, attack and win