Caltrops is also your ace in the hole, because it triggers The Incredible Hulk's Enrage ability, which can lead to endless combat turns and an infinite combo game win provided you've managed to give him Indestructible
Being able to cast the top card of your library as long as its a Goblin is eminently useful for Goblin decks that often care about getting as many bodies onto the battlefield as possible with ruthless expediency
Its also worth noting that in Hazduhrs surprisingly comprehensive lore, its stated above almost everything else that hes old, ill, and will probably be dead in a couple years
They all synergize well with the mechanic and are in the right color identities to give you good options for your 99
Skullsnatcher isnt the strongest ninja card, but its a reliable way to remove key cards from an opponents graveyard
It does fairly clearly reference MTG lotuses in its flavor text, however, so its a pretty direct tie to them