Sleipnir itself is a threatening steed, clad in black armour and flaming hair
If you draw the creature, it might not be too hard to discard it anyway
Cards like Trailblazer's Boots (Unblockable unless your opponent is playing an all-basics mana base and if they are, good luck?) and Prowler's Helm (who plays Walls these days
For one thing, having to check both a banlist and a Game Changers list when building a deck, knowing both could potentially change in the future, makes Commander feel like less of a casual format
The Best New Old Card award is given to a card thats been out for a while already, but found new use in my decks due to other new cards being printed or changes in formats and metagames
No matter, since you're typically playing this card to copy ETB or death triggers and could usually care less what happens to it