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Guttersnipe - butt sniper (or when I hav 2 or more out they are the butt brigade)
Goblin electromancer - goblin erectionmancer
Chandras Phoenix - Chandras pianist

A deck of Myrs and things that let you untap Myrs (the ones that give you mana) and then only sorceries being primal surge. Hit primal surge and play every card in your deck (til the next surge) then use artefact untappers and all the myr to use the door

I have an entire deck built around this combo and I can tell you it works perfectly. So much so I am the first target it multiplayers

The guildmage is perfect for the combo with mind crank especially since blood chief takes a while to charge. But if you need it to charge (or you need something to do damage to initiate the infinite loop) I suggest stab wounds. They deal 2 damage to the player every turn and cripple a creature slightly.
The player is forced to try and kill off the stab wound or play their counter spells etc.

Unblockable is also strong with trepanation blades. Still can't hit them to force the combo? Use codex shredder to mill for one card and so on. Codex shredder can also be used to retrieve a blood chief from the graveyard just in case the enemy naturalises it!