Common Legacy - Decks You Should Prepare to Face
>Delver Variants (Mostly Grixis and BUG)
>Czech Piles (4 Color Control)
>ANT (Ad Nauseam Tendrils)
>Death and Taxes
>Lands
>Stoneblade variants (Jeskai, Bant, Esper)
>Reanimator (Depths, RB)
>Sneak and Show
>Topless Miracles

Uncommon Legacy - Decks You Should Know About
>UB Reanimator
>Turbo Depths
>Eldrazi Stompy
>Blood Moon Stompy variants
>Burn
>TES (The Epic Storm)
>Elves
>Maverick
>4-Color Loam
>Jund
>Nic Fit

Rare Legacy - Decks You May See On Occasion
>Infect
>Enchantress
>MUD
>Goblins
>Merfolk
>High Tide
>Aluren
>Food Chain
>12 Post
>Belcher
>Pox Control
>Tezzerator
>Sneak n Breach
>Stax (White or Black)
>Deadguy Ale
>Landstill
>Affinity

Mythic Legacy - Decks You'll See Once a Year
>Doomsday Fetchland Tendrils (DDFT)
>Cheerios
>Nourshing Lich
>Non-Eldrazi Moon-less Stompy variants
>Spanish Inquisition
>Ux Omnitell
>Parfait
>The Cure (Kavu Predator + False Cure