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Perhaps a "Neither player can add cards from their hand to their Deck, except by effects that excavate a card(s)" would do

The opening move is obvious

Ryu-Ge Rivalry X TRAP Special Summon 1 "Ryu-Ge" monster from your hand, Deck, or GY, but return it to the hand during the End Phase

Crouching Moron, Hidden Badass: Weevil Underwood, one of your early opponents in the Lancastrian story, seemingly duels like a novice who keeps enacting failed fusions, but his real objective in doing so is to quickly discard any card he doesn't need and get quicker access to Cocoon of Evolution so he can equip it to Petit Moth, transforming it into Larva of Moth (DEF 2000)

You can banish this card from your hand by banishing another Walker Monster from your hand and if you do: Give as many cards your opponent to the hand back , as the half number of stars of the banished monsters

Some decks took this a step further, summoning endlessly in a loop that would force the activating party to deck out and lose