Adder-Prime

Refit 2 (When Adder-Prime enters the battlefield, you
may reveal cards from your hand with total converted
mana cost 2 or more. Shuffle those cards into your
library.)
When Adder-Prime refits, search your library for
a basic land card and put it in your hand, then
shuffle your library. You may instead Refit 4. If
you do, place that land on the battlefield instead.