Plus, with the ability to give a creature +2/+2 over and over, you're going to have a seriously buffed battlefield
From among the discarded cards, you may choose an artifact or creature card with mana value 1, you may choose an artifact or creature card with mana value 2, and you may choose an artifact or creature card with mana value 3
(2018-06-08) If a creature without counters receives enough -1/-1 counters to reduce its toughness to 0 or less, Together Forever's ability can't be activated before state-based actions put that creature into its owner's graveyard
While this list isnt fully exhaustive, I think its enough to get to the heart of answering our question
C Common Witch's Strike X TRAP If your opponent negates the Normal or Special Summon of a monster(s), or the activation of a card or effect: Destroy all cards your opponent controls and in their hand