Azula, Ruthless Firebender

Firebending 1 (Whenever this creature attacks, add {R}. This mana lasts until end of combat.)
Whenever Azula attacks, you may discard a card. Then you get an experience counter for each player who discarded a card this turn.
{2}{B}: Until end of turn, Azula gets +1/+1 for each experience counter you have and gains menace.

Cunning Lethemancer

At the beginning of your upkeep, each player discards a card.

Mandate of Abaddon

Choose target creature you control. Destroy all creatures with power less than that creature's power.

Kaito's Pursuit

Target player discards two cards. Ninjas and Rogues you control gain menace until end of turn. (They can't be blocked except by two or more creatures.)

The Death of Gwen Stacy

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Destroy target creature.
II — Each player may discard a card. Each player who doesn't loses 3 life.
III — Exile any number of target players' graveyards.

Words of Waste

{1}: The next time you would draw a card this turn, each opponent discards a card instead.

Unnerve

Scavenger Drake

Flying
Whenever another creature dies, you may put a +1/+1 counter on this creature.

Larceny

Whenever a creature you control deals combat damage to a player, that player discards a card.