(Generic)Isekai/Dungeon Test concepts: Virtual Booster

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This booster was generated with modern collation since the cardset contains mythics: 1 rare / mythic, 3 uncommons, 10 commons, 1 basic land.
You could alternatively have 15 random cards regardless of rarity.
 R 
Legendary Creature – Efreet Wizard Boss
Flying
Tier 3 (Tier 3 creatures aren't legendary as long as you control a Tier 4 creature. Creature spells you cast with Tier 1 cost {2} less to cast.)
Whenever you cast an instant or sorcery spell, gain control of up to one target creature with a mana value of 3 or less until end of turn. Untap that creature. It gains haste and flying until end of turn.
5/3
 
 R 
Enchantment
If a Boss you own would die, exile it instead.

Once per turn, you may cast a Boss card you own that was exiled this way.
 U 
Creature – Human Knight
Whenever an opponent sacrifices a Treasure, create a 1/1 white Soldier token unless that player pays {1}.
The citadel of Kolert silently submitted to Luid, and Luid would not submit to Cambis.
1/3
 U 
Legendary Creature – Spider Boss
Reach
Tier 2 (Tier 2 creatures aren't legendary as long as you control a Tier 3 or higher creature.)
Whenever a creature dealt combat damage by Tafket, Web King dies, create a Treasure token and untap target land you control.
Sacrifice three treasures: Put a deathtouch and a menace counter on Tafket.
5/5
 U 
Creature – Merfolk Wizard
Lairs you control have "{5},{t}, Sacrifice this land: Target creature cannot be blocked until end of turn."
4/2
 C 
Artifact – Equipment
{1}{u}: Tap target creature blocking the equipped creature. It gets -1/-0 until end of turn. It doesn't untap during its controller's next untap step.

Equip {1}{u}
 C 
Legendary Creature – Wolf Boss
Vigilance
Tier 1 (Tier 1 creatures aren't legendary as long as you control a Tier 2 or higher creature.)
{2}{2/g}{2/g}: Mekocz, Who'll Eat Everything gets +3/+3 until end of turn.
2/2
 C 
Sorcery
As you cast Consecrating Dance, you may pay {b/g}.

Gain 5 life. If you spent black or green mana casting Consecrating Dance, exile up to two target cards from an opponent's graveyard.
 C 
Legendary Creature – Drake Boss
Flying
Tier 1 (Tier 1 creatures aren't legendary as long as you control a Tier 2 or higher creature.)
{1}{2/u}: Until end of turn, target creature with flying you control gain "Whenever this creature deals combat damage to a player, draw a card, then discard a card."
3/3
 C 
Creature – Vampire Knight
Whenever an opponent casts a spell during the combat phase, Blood-Sworn Knight gets +1/+0 and gains first strike until end of turn.
0/3
 C 
Creature – Elf Peasant
Flash, deathtouch
Mor Gaush spreads a message of disease. No one needs to be faithful to carry that message.
2/2
 C 
Instant
Draw two cards.

Each opponent mills four cards.
Lis-Yei may not be able to kill and eat Hwalch if he swam upon the merfolk, the seas are big, and offer time to plan.
 C 
Creature – Horror
Flash
When Untouched Abandoned enters the battlefield, cards in your hand with Reward may be cast as if they had flash until end of turn.
"I'm sure there's a reason no one ventures into these ancient ruins." -Eshmoon the Healer
1/3
 C 
Legendary Creature – Rhino Boss
Whenever Arnz, Horned Obnoxiousness deals combat damage to a player, create a 1/1 green Saproling token.
Tier 1 (Tier 1 creatures aren't legendary as long as you control a Tier 2 or higher creature.)
{3}{g},{t}: Return a basic land or Lair from your graveyard to the battlefield tapped and put a reach counter on up to one target creature.
3/5
Island
 
 B 
Basic Land – Island

Invelle, the Alurring (rare, foil)
Heroic Second-Coming (rare)
Kolert Conscriptor (uncommon)
Tafket, Web King (uncommon)
Mist Stalker Sage (uncommon)
Ice Lance (common)
Mekocz, Who'll Eat Everything (common)
Consecrating Dance (common)
Su-Ahman, Thieving Wing (common)
Blood-Sworn Knight (common)
Noxious Commoner (common)
Psychic Subjugation (common)
Untouched Abandoned (common)
Arnz, Horned Obnoxiousness (common)
Island (basic)