Why isn't Shardless BUG seeing much representation? What would it need to be popular again?
Deathrite Shaman got banned, which hurt Shardless a lot, but it was already declining before that. Grixis Delver (before Deathrite banning) was really pushing it out because it could keep up with quicker strategies but also play longer. Since then a lot of strategies have picked up that I don't think Shardless would fare well against.
Standard: lol no
Modern: BG/x, UR/x, Burn, Merfolk, Zoo, Storm
Legacy: Shardless BUG, Delver (BUG, RUG, Grixis), Landstill, Depths Combo, Merfolk
Vintage: Dark Times, BUG Fish, Merfolk
EDH: Teysa, Orzhov Scion / Krenko, Mob Boss / Stonebrow, Krosan Hero