So quite literally not putting these cards in the game could break it, thats why they are overpowered
If youre lucky enough to have this card and are willing to make it less valuable by using it, then you can negate one Monster, Spell, and Trap per turn.
Teval is leaps above the zombie partner commander with the power to mill and return lands from your graveyard on top of your regular one land per turn
Attack with the Army to trigger the Ring, and use the Ring temptation to cycle your hand for four fresh cards
Wirefly Hive is a "push your luck" creature token-maker, meaning that each new Wirefly creature token comes with the risk of losing all the Wirefly creature tokens you've made up to that point
Also, I seem to be making a lot of them