mtg arcane secret lair cards Signet (Secret Drop) Arcane Signet • Secret Lair

Since it lets you cast a permanent with a mana value two or less from your graveyard, you can continuously use cards that need to sacrifice themselves to trigger

Most counterspells are blue cards, and specifically blue instants, as its what blue does best, but there are more than a few playable off-color counterspells

, , Sacrifice Myriad Landscape: Search your library for up to two basic land cards that share a land type, put them onto the battlefield tapped, then shuffle

Queza, Augur of Agonies often sees at least some wheels in its lists, but you could run it like a group hug commander with Howling Mine effects