
Mardu Devotee | Creature | Human Scout | When this creature enters, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)
{1}: Add {R}, {W}, or {B}. Activate only once each turn. | Lorenzo Mastroianni

Iridescent Tiger | Creature | Cat | When this creature enters, if you cast it, add {W}{U}{B}{R}{G}. | Fajareka Setiawan

Dragonbroods' Relic | Artifact | | {T}, Tap an untapped creature you control: Add one mana of any color.
{3}{W}{U}{B}{R}{G}, Sacrifice this artifact: Create a 4/4 Dragon creature token named Reliquary Dragon that's all colors. It has flying, lifelink, and "When this token enters, it deals 3 damage to any target." Activate only as a sorcery. | Racrufi

All-Out Assault | Enchantment | | Creatures you control get +1/+1 and have deathtouch.
When this enchantment enters, if it's your main phase, there is an additional combat phase after this phase followed by an additional main phase. When you next attack this turn, untap each creature you control. | Joshua Cairos

Bone-Cairn Butcher | Creature | Demon | 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.)
Attacking tokens you control have deathtouch. | David Palumbo

Defibrillating Current | Sorcery | | Defibrillating Current deals 4 damage to target creature or planeswalker and you gain 2 life. | Isis

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

Neriv, Heart of the Storm | Legendary Creature | Spirit Dragon | Flying
If a creature you control that entered this turn would deal damage, it deals twice that much damage instead. | Victor Adame Minguez

Reigning Victor | Creature | Orc Warrior | Mobilize 1 (Whenever this creature attacks, create a tapped and attacking 1/1 red Warrior creature token. Sacrifice it at the beginning of the next end step.)
When this creature enters, target creature gets +1/+0 and gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.) | Warren Mahy

Sonic Shrieker | Creature | Dragon | Flying
When this creature enters, it deals 2 damage to any target and you gain 2 life. If a player is dealt damage this way, they discard a card. | Jason A. Engle

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

Call the Spirit Dragons | Enchantment | | Dragons you control have indestructible.
At the beginning of your upkeep, for each color, put a +1/+1 counter on a Dragon you control of that color. If you put +1/+1 counters on five Dragons this way, you win the game. | Liiga Smilshkalne

Mardu Monument | Artifact | | When this artifact enters, search your library for a basic Mountain, Plains, or Swamp card, reveal it, put it into your hand, then shuffle.
{2}{R}{W}{B}, {T}, Sacrifice this artifact: Create three 1/1 red Warrior creature tokens. They gain menace and haste until end of turn. Activate only as a sorcery. (A creature with menace can't be blocked except by two or more creatures.) | Salvatorre Zee Yazzie

Bloodfell Caves | Land | | This land enters tapped.
When this land enters, you gain 1 life.
{T}: Add {B} or {R}. | Piotr Dura

Nomad Outpost | Land | | This land enters tapped.
{T}: Add {R}, {W}, or {B}. | Alayna Danner