There's also Helm of the Host for a more permanent alternative, Sword of Feast and Famine to untap all your lands twice for peak combat trickery, and Sword of Wealth and Power for lots of spell copying and Treasure tokens
The first is an extra point of toughness that's a big difference on a 1-drop, since Ruin Crab can effectively block creatures with 2 power
Yes, its a gold card, but a very powerful one
When it dies you have two options - force each foe to discard tow cards and lose two life or return a non-Dragon dork from any graveyard to yours for the cost of two life
Should you be able to front the six mana cost or find a way to cheat this into play it is far superior to Necropotence offering its card bounty immediately
Using them just to get a hit in is sometimes good, but not enough to warrant playing an otherwise useless card