Library of Leng

You have no maximum hand size.
If an effect causes you to discard a card, discard it, but you may put it on top of your library instead of into your graveyard.

Sol Ring

Wheel of Fortune

Each player discards their hand, then draws seven cards.

Demonic Tutor

Search your library for a card, put that card into your hand, then shuffle.

Counterspell

Dark Ritual

Island

Raise Dead

Return target creature card from your graveyard to your hand.

Terror

Destroy target nonartifact, nonblack creature. It can't be regenerated.

Nicol Bolas

Flying
At the beginning of your upkeep, sacrifice Nicol Bolas unless you pay {U}{B}{R}.
Whenever Nicol Bolas deals damage to an opponent, that player discards their hand.