mtg card symbols How To Play Magic: The Gathering | Identifying Magic Sets Expansion symbol - MTG Wiki

Realmbreaker's Grasp isnt bad but Cut Short has been a bit better, and Sunder the Gateway is more of a sideboard card

Turn that Bolt into 6 to kill that Consecrated Sphinx and draw a card too

If a player is instructed to exile cards from their library "until" a certain event occurs, that player exiles those cards one at a time

I think you could still shave a few more cards but I would wait to see after you make adjustments and play the deck for a while before cutting anything else

You can speed up the process by investing mana into it, but theres usually no need

Unless you have an effect that doubles counters on permanents you control, like Doubling Season