Force of Savagery isnt a card that merely works better as a combo pieceits that very rare card that depends on combos to even stay alive, let alone be useful
Not only is this ability an excellent mana fixer, but when Preston attacks, you may untap every enchanted permanent you own, giving you a huge boost in mana production
Most decks you encounter at an LGS will be within this tier
$0.35 Ashe, Princess of Dalmasca Final Fantasy $0.35 Gongaga, Reactor Town Final Fantasy $0.35 Quina, Qu Gourmet Final Fantasy $0.35 Tonberry Final Fantasy $0.35 Sabotender Final Fantasy $0.35 Black Waltz No
It can be clunky and there arent many options
Keep a little interaction handy (Chaos Warp, Abrade, and Vandalblast are all in here for a few cents each) and dont be afraid to sit on Krenko an extra turn to set up a haste enabler first