Heartbeat is inexpensive until you realize you might need four copies of three different dual lands.
That and most other archetype decks will stomp it before it gets set up and counter it's essential spells. I'd be siding Swift Silence and Commandeer against a deck like that, just to be stupid.
Husk is just as cheap, can run with a good mana build, and can be varied to your liking. I added Grave Pact to mine, and it makes people cry consistantly.
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