If an opponent doesnt make a play worth interacting on, you instead can leap ahead with Memory Deluge or Thirst for Discovery on their end step, which easily digs you to your monster threats or situational blowouts like Blood on the Snow
Manectric 076/182 Loading
You could even throw in Spitfire Lagac as a top-end threat
While bouncing three creatures isn't great for five mana, countering a spell isn't great for five mana, and drawing three cards is only okay at five mana, the fact that you can do things like counter a spell and draw two cards, bounce a creature and draw two cards, or bounce two creatures and counter a spell makes it so the sum of Mystic Confluence is much more powerful than its individual parts
Once you've built up your collection, you can build a variety of decks using 20 cards, then battle other players or challenge NPC trials