pokemon energy card prices - Fire SVE 002 - Pokemon 151 Base Set Type Rainbow Energy 137 SM Base

You only need card sleeves if you are playing in more competitive events or if you care about protecting cards

Cards like Elvish Archdruid and Priest of Titania are Commander staples that shine even brighter here

What might be possible

Best friends with Acererak the Archlich: If you can find a way to make that extra mana for free you can just keep looping it and win the game unless your opponents can do anything about it

Bartz and Boko, Hermes, Overseer of Elpis, Murmuration, Soulcatchers' Aerie, and Valley Floodcaller all do their best when you stuff a flock's worth of birds into one deck

Blighted Agent is a nice and reliable way to deal infect damage, and its an excellent equipment user to boot