Quickdraw,
EnduranceContract 2: Discard your hand and draw three cards. Deal 2 damage to the enemy player for each spell discarded this way.
Card sounds may differ from in-game as they get updated.
Endurance - Units with Endurance ready at the start of each players turn, so they can attack and still be ready to block during the enemy turn. Additionally, they are completely immune to enemy stun and exhaust effects.
Quickdraw - Units with Quickdraw kill blockers before they can deal damage back. Note that Quickdraw only works while attacking, not while blocking.
Contract - You may pay the number in additional power to get its bonus. If you don’t have enough power to pay some or all of the Contract, the remaining balance is applied as “debt” that is paid at the start of the next turn.
Debt - Your available power is spent to pay off Debt. If you can't pay it all, you pay at the start of your next turn.