Wheels are generally fine in a vacuum, but its very easy to abuse these and create disgusting advantages
It lets you cheat a Dragon from the top eight cards of your library every time it enters or attacks
Finally, here is the art description for the card
If you sacrifice the creature targeted by the equip ability, then the ability won't resolve and the Equipment will remain attached to whatever it was attached to (if anything)
Katara, Water Tribes Hope is a Blue/White Human Warrior Ally with vigilance who creates a 1/1 white Ally creature when she comes into play
Take Tinybones (a card that worried a lot of people), add a pinch of Opposition Agent (a card that worried everyone), and a dash of It That Betrays (a card that costs over two times as much mana as Tergrid) and you have a recipe for a very fundamentally punishing, unfun and oppressive commander that's going to encourage players to load up on discard and edict effects and allow them to not have to run much more than that