These decks generally want to assemble some sort of infinite combo utilizing a ton of smaller pieces and a sacrifice outlet
And if you can find other ways of putting extra counters on Sharktocrab, then the tapping ability will just keep winning you games
MTG M20 Spoilers: Every Card Revealed So Far Risen Reef Creature - Elemental Whenever Risen Reef or another Elemental enters the battlefield under your control, look at the top card of your library, If it's a land card, you may put it onto the battlefield tapped
But because it costs so much, you should be able to cast it from the graveyard, and maybe it isnt a creature unless you do
It exists in a similar space to Bloodroot Apothecary, but I prefer it in the average deck given that 4 damage gets you closer to killing your opponent than 4 poison
Wizards of the Coast didnt officially adopt the fan-made format until 2011