The back faces of TDFCs don't have a mana cost
In essence, every MDFC is a slightly overcosted spell combined with a slightly underpowered land (thanks to coming into play tapped or costing three life to come into play untapped, in the case of the mythic MDFC cycle, and only tapping for one color of mana)
Imoen, Chaotic Trickster can't be blocked
Normally, they make cards like that unable to block
Whats more, you can add card-draw punishment or discard payoffs with cards like Sheoldred, the Apocalypse or Waste Not
1-Mana Cantrips Renegade Tactics Ancestral Anger Warlord's Fury Rile Telim'Tor's Edict Crash Through Crimson Wisps Expedite Overmaster Might of the Meek Impolite Entrance You can run these for their main effects, but theyre generally slightly sadder versions of Opt and Consider for spellslinger and storm decks