mtg goat cards Magic The Gathering - Mountain Mountainwalk (This creature cant be blocked as long as defending player controls a Mountain.) Mountain Goat — Portal (POR)

You cant cycle from the command zone, which makes the other half irrelevant

As that trigger resolves, the battle is exiled and then the back face is cast without paying any mana cost which is handy as the back sides dont have mana costs, anyway

Each Core Set 2021 Draft Booster Box contains 36 M21 draft booster packs (540 cards) and 1 two-sided token/ad card

Atomic Microsizer Beamtown Beatstick Bilbo's Ring Blazing Torch Brotherhood Regalia Chitinous Cloak Cryptic Coat Daredevil's Billy Club Draugr's Helm Dredging Claw Executioner's Hood Experimental Armor Gimli's Axe Glaive of the Guildpact HYDRA Disintegrator Hedgewitch's Mask Hot Soup Mask of Riddles Mechanical Glider Nim Deathmantle Nuka-Nuke Launcher Phantom Blade Prowler's Helm Psychic Paper Rope Saddle of the Cavalier Scrounged Scythe Silver Shroud Costume Skeleton Key Skyblinder Staff Thieves' Tools Trailblazer's Boots Vectis Gloves Vorrac Battlehorns Whispersilk Cloak Wings of Hubris Wolfrider's Saddle Wrecking Ball Arm

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Repeated instances of paying the mutate cost will get expensive (especially with the double blue requirement), but fortunately youre in a color that has some bounce capability