It takes a ton of setup and investment to do so, but in decks focused on activating the effect, you can accomplish it more easily
Myriad on my best creature each turn lets me make a big impact on the game, that and the combination of first strike, vigilance, and trample might be my favorite
Commander Commander (CTRL to add secondary) Buff Buff (CTRL to add secondary) Cost Reduction Herald's Horn As this artifact enters, choose a creature type
Omarthis, Ghostfire Initiate If you can spend a bunch of mana into its X cost, Omarthis, Ghostfire Initiate can manifest a ton of cards from the top of your deck
It just works with some artifact dorks and equipment and mana rocks
[c]Baleful Strix[/c] is always a great reprint and fits into virtually every blue-black deck in Legacy for being able to answer almost any attacking creature and to draw a card