Ulasht in exile (exiled by Agatha's Soul Cauldron).
All other permanents on the battlefield.
Kresh the Bloodbraided has at least one +1/+1 counter on it.
({1} magic symbol) available.
Steps
Activate Kresh the Bloodbraided using Ulasht's ability by paying ({1} magic symbol) and removing a +1/+1 counter from it, creating a 1/1 Saproling creature token.
Activate Phyrexian Altar by sacrificing the Saproling, adding ({1} magic symbol) .
When the Saproling dies, Kresh the Bloodbraided triggers, putting a +1/+1 counter on itself.