Combos Utilizing Power-Surge

tap all of unused lands to goblin war drums, your opponent takes damage before and at end of his/or her turn.

no matter what happens your opponent takes damage and you get to do whatever you want

use mana flare to limit lands that get tapped, dump all of your left over mana into the wall of fire (or similar) your opponent dies and you laugh.

keep tapping your lands to warcaddance and let them feel the burn

You can only untap 1 land a turn, and if you have land untapped at end of turn, take damage. Oh yeah, You can spend your 1 every turn on tapping things which won't untap any time soon.

build your deck to gain life w/artifacts, spells, etc...-then play this and watch em burn no matter what they do.

turnabout untaps opponents lands at end of your turn. then, during opponents upkeep, sands of time taps all their lands, and then power surge deals it's damage.

put all of these together in play. watch your opponent die real fast

Basically, Power Surge deals damage for untapped lands and ManaBarbs deals damage for tapped lands. Before your turn bounce back the card(s) if you have 2 Time Elementals. Watch your opponent die.

Awakening makes it hard for anyone to keep their lands tapped, and thus avoid the damage from the Power Surge. The Engine is there for you to put your mana into, and avoid the Power Surge's damage.