It seems that, with an average CMC of about 1.0, you're probably best off running 19 lands, although there could be an argument for 18 in some builds
What does it eat for breakfast
Because it has lifelink, Walking Ballista will then give you one life, which triggers Heliod, Sun-Crownd's other ability, allowing you to put a +1/+1 counter on Walking Ballista
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(Put the top two cards of your library into your graveyard.) : Target Insect gets +1/+0 and gains deathtouch until end of turn
Only one Stadium can be active at a time, and to remove one, youll either need to play a new Stadium card or have a card with the ability to remove a Stadium from the playing field