Zameck Guildmage's first ability by paying ({G} magic symbol) ({U} magic symbol) , causing each creature you control to enter the battlefield this turn with a +1/+1 counter on it.
Cast
Cryptic Trilobite by paying ({0} magic symbol) , causing it to enter the battlefield with a +1/+1 counter on it due to
Zameck Guildmage.
Activate
Together Forever by paying ({1} magic symbol) , targeting
Cryptic Trilobite.
Activate
Cryptic Trilobite by removing a +1/+1 counter from it, adding ({C} magic symbol) ({C} magic symbol) that can only be spent to activate abilities.
Cryptic Trilobite dies as a state-based action due to having 0 toughness, triggering
Together Forever, returning
Cryptic Trilobite from your graveyard to your hand.
Repeat from step 2.
Results
Infinite LTB.
Infinite ETB.
Infinite death triggers.
Infinite storm count.
Infinite colorless mana that can only be spent to activate abilities.