The options for mana dorks that are also Allies is extremely slim, too, which only makes this card more valuable to your deck
Ive excluded [casthaven]Gemstone Caverns[/casthaven] (which essentially lets you turn being on the draw to being on the play), [casthaven]Urborg, Tomb of Yawgmoth[/casthaven], and [casthaven]Vesuva[/casthaven] since they dont produce multiple mana (but can when combined with lands on this list)
They buy in bulk, pick up mid-value singles, and sometimes purchase entire collections if the price makes sense
Doctor Doom allows Connive to benefit you no matter the outcome: when you discard a land card, each opponent takes 2 damage, and if it's a nonland card, you still place a +1/+1 counter on the creature that Connived
Each stadium card has its own rules