Gazexta, Awoken Horror

When Gazexta, the Awoken Horror enters the battlefield, each opponent loses all poison counters, and you sacrifice
all permanents that added mana to you mana pool this game. If no lands are sacrificed, destroy all other creatures, and
target opponent creates a 1/1
Phyrexian Sacrifice token with: When this creature blocks, you get a poison counter.
At the begining of your end step, create a 1/1 green insect creature token with infect.
At the beggining of your upkeep, sacrifice Gazexta, the Awoken H