Flying
If Szadek, Lord of Secrets would deal combat damage to a player, instead put that many +1/+1 counters on Szadek and that player mills that many cards.
If another effect would prevent Szadek's combat damage from being dealt to the defending player or replace it with something else, that player chooses which effect applies first. For example, the player can choose to first have Mending Hands prevent 4 of the damage and then apply Szadek's ability so that it gets only one counter.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.