Its not hard to engineer Psychic Frog kills alongside Prowler, with Frog gaining Flying by exiling just three cards from your yard
Trying to keep pace with the agro decks using pure card draw effects and efficient answers simply doesn't work, the card draw is not cost appropriately to do this
That doesn't stop Sabertooth from excelling at what it does
This to me is a really attractive extra cost on top of the 1UU to cast it, and I can see it being roughly five mana and tapping some creatures to get this effect
Impact Tremors helps you get around effects like Ghostly Prison, and Berserkers Onslaught turns your dancing elementals into a mosh pit, letting you thrash your way through even the thickest defenses
That card, however, is much the exception