Havenwood Siege

As Havenwood Siege enters the battlefield, choose Thallids or Elves.
Thallids - At the beginning of your upkeep, double the number of spore counters on target fungus you control.
Elves - Fungus and Saproling creatures you control are Food artifacts in addition to their other types and have "{2}, {t}, Sacrifice this artifact: You gain 3