mtg cards with x cost What are creature colorless mana cost? double the value of X mtg x cost cards Mana

Technically Soundwave, Sonic Spy/Soundwave, Superior Captain also plays in this space, but the card is dumb on so many levels that I refuse to acknowledge its existence beyond this paragraph

It's full of all the B-tier dual lands we've come to expect from Commander precons, with little utility between the cracks

For two Blue and generic mana you get an Esper identity leader who is easier to cast from the Command Zone and arrives very early on

Destroy target enchantment

Aurelia and her retinue are excellent as part of your battallion, and the MKM Aurelia can generate plenty of card draw for anyone attacking wide

Reveillark's death trigger will activate again, you can repeat the whole loop as many times as you want: use Reveillark to bring Karmic Guide back, use Karmic Guide to bring Reveillark back, sacrifice them both to Phyrexian Altar