Just a flash, or in later games, a tiny stab, perfectly representing its First Strike and Deathtouch abilities when it attacks
It's a giant monster that arrives at instant speed, it can't be countered, and it bounces nonland permanents or spells on the stack whenever you cast something
With knights such a prevalent and supported type (there are over 500 cards with the knight subtype), it has more than earned its place as a viable archetype
Grim Return is certainly a unique card, and this type of thing is almost never unplayable
Normally bans are announced in specific and predictable timeframes
Between the new(ish) strategies, twists on old mechanics, and clever new-to-Magic designs in each deck, theres always something interesting in these precon line-ups