New sets release every few months, but the window to grab anything at retail is brutally short which is why timing, automation, and a solid technical setup are the difference between landing a box and refreshing an empty cart
For all intents and purposes, drawing cards from an artifact's effect is the exact same as drawing cards from a green creature's effect, or a white enchantment's effect
In terms of sacrifice outlets , youre looking at playing Golgari Guildmage, Nantuko Husk, and Vish Kal, Blood Arbiter
I suck at math, but luckily Frank Karsten covered this very problem in an excellent article that I highly recommend reading
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Building a Ramp deck that can take advantage of Hour of Promises ability to make Zombies as well as cast an early Ulamog, the Ceaseless Hunger is going to be key