If you want an Astral Cornucopia with three charge counters, the mana cost would be , or 9 mana total
Harsh Mentor isnt a bad card but feels like it doesnt serve much of a purpose in this deck, the same as Gimli of the Glittering Caves
Let apply this criteria to the digital only planeswalkers and evaluate them
As Foretold is a unique card, only printed once at mythic, and - by far - the best way to make a deck full of free suspend cards work in Modern
Ancient Arsenal Creature (22) Eivor, Battle-Ready Escarpment Fortress Surtr, Fiery Jtun Settlement Blacksmith x3 Keen-Eyed Raven x4 Spartan Veteran x2 Labyrinth Adversary x3 Bureau Headmaster x3 Ezio, Brash Novice Arbaaz Mir Towering Viewpoint x2 Instant (5) Battlefield Improvisation x2 Misthios's Fury x3 Enchantment (3) Artifact (6) Raven Clan War-Axe x2 Headsplitter x2 Hookblade x2 Land (25) Stone Quarry x3 Plains x11 Mountain x11 Ancient Arsenal is a straightforward Boros equipment deck with an aggressive game plan of attacking and getting in chip damage via random burn effects stapled to its cards
What's the practical application of gaining control of other player's graveyards