
Barrensteppe Siege | Enchantment | | As this enchantment enters, choose Abzan or Mardu.
• Abzan — At the beginning of your end step, put a +1/+1 counter on each creature you control.
• Mardu — At the beginning of your end step, if a creature died under your control this turn, each opponent sacrifices a creature of their choice. | Tuan Duong Chu

Inevitable Defeat | Instant | | This spell can't be countered.
Exile target nonland permanent. Its controller loses 3 life and you gain 3 life. | Cristi Balanescu

Mardu Siegebreaker | Creature | Human Warrior | Deathtouch, haste
When this creature enters, exile up to one other target creature you control until this creature leaves the battlefield.
Whenever this creature attacks, for each opponent, create a tapped token that's a copy of the exiled card attacking that opponent. At the beginning of your end step, sacrifice those tokens. | Chris Seaman

Thunder of Unity | Enchantment | Saga | (As this Saga enters step, add a lore counter. Sacrifice after III.)
I — You draw two cards and you lose 2 life.
II, III — Whenever a creature you control enters this turn, each opponent loses 1 life and you gain 1 life. | Clint Lockwood

Zurgo, Thunder's Decree | Legendary Creature | Orc Warrior | Mobilize 2 (Whenever this creature attacks, create two tapped and attacking 1/1 red Warrior creature tokens. Sacrifice them at the beginning of the next end step.)
During your end step, Warrior tokens you control have "This token can't be sacrificed." | Steve Prescott

Felothar, Dawn of the Abzan | Legendary Creature | Human Warrior | Trample
Whenever Felothar enters or attacks, you may sacrifice a nonland permanent. When you do, put a +1/+1 counter on each creature you control. | Victor Adame Minguez

Revival of the Ancestors | Enchantment | Saga | (As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Create three 1/1 white Spirit creature tokens.
II — Distribute three +1/+1 counters among one, two, or three target creatures you control.
III — Creatures you control gain trample and lifelink until end of turn. | Clint Lockwood

Severance Priest | Creature | Djinn Cleric | Deathtouch
When this creature enters, target opponent reveals their hand. You may choose a nonland card from it. If you do, exile that card.
When this creature leaves the battlefield, the exiled card's owner creates an X/X white Spirit creature token, where X is the mana value of the exiled card. | Scott Murphy

Yathan Roadwatcher | Creature | Human Scout | When this creature enters, if you cast it, mill four cards. When you do, return target creature card with mana value 3 or less from your graveyard to the battlefield. | Inkognit