Damage Pump allows you to spread your damage counters even further so that you can get into OHKO potential and take some quick Knock-Outs
This slots perfectly into many already popular white mana decks, and it is impossible to argue against the potency of a spell like this one
some of these were answered by skimming through the manual again
Acid-Spewer Dragon Acidic Slime Acidic Slime Aether Poisoner Aetherblade Agent Agent of the Fates Ahriman Akroma, Vision of Ixidor Alela, Artful Provocateur Alpharael, Dreaming Acolyte Ambush Viper Anhelo, the Painter Animus of Predation Ankle Biter Ankle Shanker Aphelia, Viper Whisperer Aragorn, Company Leader Archetype of Finality Archpriest of Shadows Argivian Avenger Arisen Gorgon Armed Assailant Arno Dorian Arnyn, Deathbloom Botanist Arvad the Cursed Ashnod the Uncaring Ashnod, Flesh Mechanist Assassin Initiate Astarion, the Decadent Atraxa's Skitterfang Atraxa, Grand Unifier Atraxa, Grand Unifier Atraxa, Praetors' Voice Attercop Aurora of Emrakul Aveline de Grandpr Aven Heartstabber Avenger of the Fallen Axebane Ferox Ayli, Eternal Pilgrim Baleful Eidolon Baleful Strix Bane-Marked Leonin Barrowgoyf Battlefly Swarm Bebop, Skull & Crossbones Bilious Skulldweller Bitterblade Warrior Bitterheart Witch Black Waltz No

Many make use of the voting mechanic, and let you cook the votes in your favor