Ravnica went out of its way not to use guild mechanics on hybrid cards
Featuring the eminently rare eminence ability (see what I did there?), this Wizard allows you to duplicate any nontoken Wizard that enters the battlefield under your control by paying one colorless mana, though those tokens are exiled at end of turn
Smothering Tithe Mono-white can struggle with ramping and making mana, something that Smothering Tithe helps to counteract
But you can then respond to any triggered abilities the morphed creature may have before your opponent can continue casting spells
Enchantment - Aura Color tag templates(None) Traverse the Outlands Search your library for up to X basic land cards, where X is the greatest power among creatures you control
However, black mana received new importance in Magic's Vintage format with the release of Tales of Middle-earth and perhaps the most disruptive card Vintage has seen in years: Orcish Bowmasters