He is legendary, and that's a limitation, yet he reads Johnny deckbuild
Another way you can make the most out of the discard side of the card is madness
Submerge Market Price: $4.80, Foil: $60.95 Part of a series of cards that can be cast for free as long as an opponent (thats any opponent, for you Commander players out there) controls an enemy-colored land, Submerge is the most valuable of this series from the Nemesis set by far, as it hoses green Stompy decks with ease
This card is unique in that it allows for the creatures it destroys to be regenerated, providing the user a bit of an out when decimating everything else on the field
As far as Limited goes, you cant afford to lose too much life, so Bob is much more powerful in aggressive decks because their mana curve tends to be lower