Whatever definition you use for weird, there are plenty of strange cards and interactions to be found in Magics card archives
Descendants' Fury ( DT, MC, F, R, ETB ) - Descendants' Fury is 4 mana, which is on the high end of an enchantment that does nothing on its own
But if I lose all of them, Im screwed
if you have no other cards in your graveyard, Elixir can gain you 5 life per turn
Central Elevator's ability lets you search your library for any Room card that shares a name with a Room you control on the battlefield, checking only the names of unlocked doors
Cavern of Souls A lot of Magic cards garner a high price tag because theyre just rare, but Cavern of Souls is expensive because so many decks want it