An opponent is unable to block and kill Varragoth.
({1} magic symbol) ({B} magic symbol) on your first turn, with ({4} magic symbol) ({B} magic symbol) available each extra turn available.
Steps
Declare Varragoth as an attacker.
Activate Varragoth by paying ({1} magic symbol) ({B} magic symbol) , searching your library for Draco, then shuffling your library and putting Draco on top of it.
During the next upkeep, Timesifter triggers, exiling Draco and causing you to get an extra turn after this one.
Activate Emiel by paying ({3} magic symbol) , blinking Riftsweeper.
Riftsweeper enters the battlefield, shuffling Draco from exile into your library.