Random Ideas: 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 – Horror Avatar
Vigilance, Deathtouch, Trample.
As long as your life total is less than 13, non-human creatures you control get +X/+X, where X is 13 minus your life total.
6/6
 U 
Land – Fortress
Pay 1 life, {t}: Add {w}.
As long as Steppe Bastion is tapped, blocking creatures you control get +0/+1.
 U 
Sorcery
Gain control of target creature until end of turn. Untap it. It gains haste until end of turn. Creatures you control can't be blocked this turn.
 U 
Instant
Draw two cards, then discard a card.
 C 
Creature – Human Rogue
Covert (Dimir Nightwalker can't be blocked except by creatures that share a creature type with it.)
2/2
 C 
Creature – Dinosaur
Hone- {r}{r}{r}: Put a first strike, trample, or menace counter on Titanic Monstrosaur.
6/5
 C 
Creature – Wall
Defender
Thoughtborn- Wall of Ideas gets +0/+1 for each card you've drawn this turn.
0/5
{r}
 
 C 
Instant
Creatures you control gain trample until end of turn.
Fuse.
Burn
{r}
 
 C 
Instant
Burn deals 2 damage to target creature.
Fuse.
 C 
Artifact Creature – Construct Mutant
Whenever you cast an artifact or creature spell, put a +1/+1 counter on Biosteel Adept.
1/1
 C 
Creature – Merfolk Druid
Legacy {u} ({u}, Exile Mentor of the Deep from your graveyard: Copy its activated ability.)
{4}, {t}: Target player puts the top 4 cards of their library into their graveyard.
0/4
 C 
Creature – Human Shaman
{t}: Target creature gets +2/+1 and becomes a Cat in addition to its other types until end of turn.
2/1
 C 
Instant
Bolt Catalyst deals 1 damage to any target.
Catalyze- Exile the top card of your library. You may play it this turn.
 C 
Creature – Elemental
Granitic- Igneous Charger has: "{t}: Igneous Charger deals 1 damage to any target" as long as you control four or more mountains.
2/1
 C 
Instant
Create two 1/1 white Soldier creature tokens.
Draw a card.
Mountain
 
 B 
Basic Land – Mountain

Uccamot, the Growing Dark (rare)
Steppe Bastion (uncommon)
Breach from Within (uncommon)
Ethereal Course (uncommon)
Dimir Nightwalker (common)
Titanic Monstrosaur (common)
Wall of Ideas (common)
Crash // Burn (common)
Biosteel Adept (common)
Mentor of the Deep (common)
Lionmaw Charger (common)
Bolt Catalyst (common)
Igneous Charger (common)
Call the Militia (common)
Mountain (basic)