mtg cards like unbound flourishing These Commander Upgrades are Tripling in Price! if that spells mana cost or that abilitys activation cost contains X MtG Modern Horizons Mythic Rare

After all, who heard of a wall dropping dead of fright

This is a much cheaper card since its ban

While Landfall effects vary greatly, all Landfall abilities trigger whenever a land enters the battlefield under its owner's control, allowing for a given effect to be utilized several times within a game

Not forgetting of course you still need the equipment aspect too

A good number of them are Humans just keep in mind that you cant cast their adventures with Aether Vial or with mana from Unclaimed Territory

That combo is what makes them so absurdly good: Underground Sea, for example, is both an island and a swamp, so it works perfectly with fetch lands and fixes your mana super smoothly