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The Grand Calcutron itself doesn't modify hand size

The last option is to not bring in Disenchant, which was a pretty bad idea, but ever since Councils Judgment became a thing this might actually be the best way to handle this disequilibrium

It's also big

1 Ureni, The Song Unending Power Unleashed The massive Spirit Dragon Ureni, the Song Unending is not only a beast on the battlefield, but a pretty significant undertaking in terms of mana

This is what's called a combo (combination) deck

It has a reasonable downside of having to put a card from your hand on top of your library, being able to stop all damage from an instant or sorcery