It is now clear most high tier decks have one thing in common. Portal fuses artifacts and builds up puppets in their hand; Rune stacks up large spellboost values in their hand; Forest prepares as many 0 and 1 cost cards for optimal Roach value.

As full board clear is already omnipresent, the next step is clear to me: It is time to introduce hand disruption.

Shuffle the opponent's hand into the deck and make them redraw. Look at their hand and shuffle cards back. Crest that reduces the maximum hand size to 4. Evil Bellringer makes the opponent discard a card on fanfare and evo. Shuffle back the lowest or highest cost card in their hand.
Gone are the cost reduced cards. Gone are the fairies, puppets and gundam pieces. Maybe they will be even drawn later, diluting their deck with garbage.

As today no cards may remain on the board, tomorrow no cards will even remain in either player's hands.