Its a huge 6/6 body that can be cost for as little as two mana later in the game, thats big enough to not only tangle with Selesnyas big creatures, its also cheap enough to leave mana open for combat tricks
Modern Horizons 2 shifted the format so much that some even joke that the Modern format had a rotation even though it is an eternal format
The real power of cards like Grief comes when you combine it with blink effects like Ephemerate, which allow you to get two ETB triggers and keep the creature in play
The front side shows him as a Dark Knight with deathtouch
The first deck of that era is entitled Timey-Wimey , focusing on the Suspend and Vanishing mechanics, both of which involve the aptly-named time counters
The idea for this came from me not really owning any real Constructed decks in paper at the time, having gotten into Pauper as a way to be able to play on a budget