One such iteration is this version of the Rakdos (red/black) Anvil deck, which looks to provide the Anvil fodder with familiar cards like Experimental Synthesizer, Voldaren Epicure, and Bloodtithe Harvester, while repeatedly attacking in with an indestructible flying Dragon
You won't draw a card even if that creature is legendary
That leaves us with 3 good learn cards and another 3 or so that are potentially enough for cube
This can even do work in Standard with cards like Hylderblade or Dark Knight's Greatsword
Felidar Retreat and Rampaging Baloths give us backup ways of making tokens as we play our Towns to make sure that we have enough bodies for The Wandering Minstrel to be lethal, all while drawing an absurd amount of cards with Travel the Overworld Ramp up to seven mana
A card must already be exerted in order to be challenged, meaning you cant challenge characters played on your opponents last turn