(Put the top two cards of your library into your graveyard.) : Target Insect gets +1/+0 and gains deathtouch until end of turn
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
When youre able to attack with Etali, all bets are off because getting up to two valuable spells that you are able to cast immediately without paying their mana costs, not just draw the spells but cast them right away, is incredibly valuable and has the potential of taking over almost any game
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