So, Obelisk of Bant? At least the banner cycle from Khans had an upside, albeit not a great one. Maybe a second, flavorful ability would be better suited.

True. I'd play this every control deck I owned, regardless of color. In fact, the activation could come with the line "Sacrifice this land" and I'd still put it in a few control decks.

Yeah, I'd kinda want this to replace everything except my first and second land drops in most decks. And (assuming a cycle) I'd be mildly worried about degenerate decks that run extra land drops and quickly filter down to a very tiny deck, that just incidentally has a tonne of lands in play.

Mind you, that also sounds like an awesome fun combo deck to try and build.

That's a lot better. Still way, way too good, though. I'd play this in monogreen or monoblue decks... and in fact I can imagine some monowhite or monored decks playing it.

Yeah, that seems fine. I think by comparison with Engineered Plague this could easily cost or rather than .

Niice. It's Dralnu, Lich Lord, but affecting all graveyards, coming with a free Rise from the Grave, and without the drawback.

Interesting effect. Prevents the trick of Act of Treason then sacrifice. But on its own, this is an extremely narrow effect that's not worth a card at any mana cost. Even if I was playing white in limited, and was sideboarding against an opponent who'd shown me two Threatens and two sac outlets, I still wouldn't sideboard this in, because it's just got too little chance of coming up and doesn't do enough even when it does come up. On the other hand, if this was one of two effects on a card, or even better was the rules text of a creature card costing something like 2/2 for WW, it'd be fine.

Colour-pie-wise, this effect would be more at home in blue than in black.

Elephantgiantship? :) This a really funny card.

See Dothraki Raid.