If you choose to sell, the app walks you through the process
(Zero is even.) At the beginning of your first main phase, put a +1/+1 counter on Sab-Sunen
The reasons for using the artifact base are to increase your odds of making a turn one play infect creature and to be able to abuse things like Cranial Plating and Arcbound Ravager for killing blows out of nowhere
If Soltari Guerillas assigns combat damage to any opponent, you may redirect that damage to target creature. VS Pay 0: The next time Soltari Guerrillas would deal combat damage to an opponent this turn, it deals that damage to target creature instead. Upon initial reading of the card as it exists, it seems like you have to deal combat damage to a player to activate Soltari Guerillas ability, but you can actually activate it at will
There are about 50 copies total on that site, including 20 or so held by ChannelFireball, but the curve from $25 to $40 is relatively steep past the first 10 copies, and the rest of the web is carrying another 50-60 copies with a similar price curve
Sitting at a tiny two mana, Saheeli can come down quickly and start accumulating value almost immediately
