mtg precon commander decks duskmourn Magic The Gathering House of Horror Deck Endless Punishment Black/RED (SD4) : Toys & Games and thematic Duskmourn spells MTG Duskmourn - Death Toll

Whenever a creature you control deals combat damage to an opponent, draw a card

It costs one more than Thran Dynamo, yes, but it also lets you eventually get access to ludicrous amounts of extra mana, more than you could ever dream of having access to

Once Splitskin Doll's ability begins to resolve, players can't take actions in between the time you draw a card and the time you would discard a card

Four mana for this effect can really help drag you back into the game, but if you're desperate enough to warp for four mana, you're likely not really doing much else on your turn

Someone likely already built a deck where the entire mana value of all the cards in the deck combined is just 13, so its impossible for them to overshoot

This is an uncommon meld combination that is battlecruiser powerful