The more spells you cast, the more likely you are to drain their life
Town Greeter fills a similar role in Golgari Roots and Golgari Graveyard, stocking the graveyard while generating card advantage
1 x Card Box
It also uses the power of Sapphire to ramp by adding extra cards to your inkwell, so you can do more than your opponent
Current data on which of the new top decks (Amber/Emerald Elinor, Amber/Ruby Boost, Amber/Amethyst Midrange, Amber/Steel Steelsong) run Evasive as their defining mechanic wasn't confirmed in this update, so the matchup-specific advice below is left as the deck's general game plan against the two structural opponent types rather than named current decks
Thancred Waters* Thancred here is a good protection creature, hopping in with flash to protect a legendary permanent as long as hes around, and able to get some protection himself, but 5 mana is a lot for this type of effect