It's meh, I think it's a fun concept but I don't really like it outside of potential Limited play
It can essentially grant a permanent Trailblazers Boots for five mana, but it can also target your opponents creatures, making it a perfect political tool
For matches where a clear winner and a loser need to be found, such as in knock-out tournaments, if a situation occurs where both players control Garnet and the regular game time and extended time have already elapsed, with judges ruling that no difference in the respective amounts of damage inflicted will occur even if play continues, that game is declared a draw and the winner is decided using a random method such as tossing a coin or rolling a dice
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Emerge decks will play it because it exudes a ton of value, and midrange and control decks may maindeck or sideboard it because it acts like a damage sponge
Reprints like those found in Foundations may have little to no impact on card value