Sett

When a buffed unit you control would die, you may pay and exhaust me to spend its buff and recall it exhausted instead. (Send it to base. This isn't a move.)
When you conquer, ready me.

When I'm played and when I conquer, buff me. (If I don't have a buff, I get a +1 buff.)
Spend my buff: Give me +4 this turn.

[Tank] (I must be assigned combat damage first.)
I get +1 for each buffed friendly unit at my battlefield.

Buff a friendly unit in your base, then move it to a battlefield. (If it doesn't have a buff, it gets a +1 buff.)