Otherworldly Gaze If you count Surveil spells as self-mill (and I do, given how rarely you see triggers that care exactly how cards end up getting from your library to the graveyard), then Otherworldly Gaze is as good a choice as any for the most consistent, efficient, no-bells-and-whistles version of the effect
Murktide Izzet Murktide has returned to A Tier this month after a strong showing over the last weekend
Its never going to be overpowered, and that can be a good thing
They are undeniably powerful spells, but part of what makes both work well is their text boxes being simple, minimalist, and straightforward
#15 What about
Between back-breaking enchantments and powerful enchantment creatures, the synergy can be so strong that its remained a consistent player in various formats metagames over the years