You can mutate it with a great reprint like Cold-Eyed Selkie for some strong commander damage, which is the decks primary threat angle
Its likely not nearly as useful as people predicted it would be and the price tailing off on TCG as sellers race to the bottom coincides with there not being all that much you can do with this card
Some notable characters and their (imminent) birthdays include: Eiko Carol - March 21 Gladio - April 2 Ardyn - April 30 Tifa - May 3 However, it seems unlikely that every character with a known birthday will get their own special spoiler day
As a group, decks using companions have too high of win rates and metagame share in Standard, Pioneer, and Modern, and have already necessitated bans in Legacy and Vintage
Grixis decks try to clear the board and get rid of the opponents hand until they are in a top-deck situation, which is where Tibalt will likely shine the most
What set is Chains of Eminence (1) from