Activate the Black Lotus token by sacrificing it, adding ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Repeat.
Once you have infinite colored mana, you may sacrifice them for infinite mana, and then cast any other card except Shivan Dragon using Garth One-Eye's ability.
Results
Infinite Black Lotus tokens.
Infinite card draw for any number of players.
Infinite casts of all spells permitted by Garth One-Eye except Shivan Dragon.