Hindsight (Experiments): 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.
Jasconius Archipelago
 
 R 
Legendary Land – Island
({t}: Add {u}.)
Whenever Jasconius Archipelago attacks, you may exert it. If you do, until your next turn, whenever you tap an Island for mana, add an additional {u}.
{u}: Put Jasconius onto the battlefield from the command zone. This ability costs {2} more to activate for each time it was activated this game.
{4}{u}{u}{u}: Jasconius becomes a 6/8 blue Fish creature.
Jasconius can be your commander.
Brutality
{2}{r}{r}
 
 U 
Creature – Incarnation
Menace (This creature can't be blocked except by two or more creatures.)
Brutality attacks each turn if able.
{r}{r}{r}: Target creature gets +1/+0 and gains menace until end of turn. Activate this ability only if Brutality is in your graveyard.
5/2
Saffiyah's Summons
{1}{u}
 
 U 
Sorcery
Put a 1/1 blue Human Pirate creature tokens with flying onto the battlefield.
Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)
Curse of the Albatross
{1}{u}
 
 U 
Enchantment – Curse
Enchant player
Whenever a creature you control dies, you may pay {1}{u}. If you do, enchanted player sacrifices a permanent.
Spear Barracade
{3}
 
 C 
Artifact Creature – Wall
Defender, first strike
{t}, Sacrifice Spear Barracade: Up to two target attacking creatures each get +1/+0 and gain first strike until end of turn.
2/3
Get A Clue
{u}
 
 C 
Instant
Investigate (Put a colorless Clue artifact token onto the battlefield with "{2}, Sacrifice this artifact: Draw a card.")
Retrace (You may cast this card from your graveyard by discarding a land card as an additional cost to cast it.)
Oilscale Eidolon
{u}
 
 C 
Enchantment Creature – Fish Spirit
Bestow {1}{u} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
Islandwalk
Enchanted creature gets +1/+1 and has islandwalk.
1/1
Wardshell Tortoise
{1}{g}
 
 C 
Creature – Turtle
{t}: Wardshell Tortoise gets +0/+3 and gains hexproof until end of turn.
1/1
Roil Twister
{4}{c}{c}
 
 C 
Sorcery
Exile target permanent.
Teferi's Visions
{x}{u}
 
 C 
Sorcery
Scry X.
Madness {x} (If you discard this card, you may cast it for its madness cost instead of putting it into your graveyard.)
Wyluli Spirit Guide
{1}{g}
 
 C 
Creature – Wolf Spirit
Bloodrush – {1}{g}, Discard Wyluli Spirit Guide: Put a +1/+1 counter on each of up to two target attacking creatures.
2/2
Rabian Raider
{r}{r}
 
 C 
Creature – Human Nomad Warrior
At the beginning of your end step, if Rabian Raider didn't attack this turn, Rabian Raider deals 2 damage to you.
Dash {2}{r} (You may cast this spell for its dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand at the beginning of the next end step.)
2/3
Purple Haze
{b}
 
 C 
Sorcery – Song
All creatures get -2/-0 until end of turn.
Splice onto Song-Exile a card from your graveyard.
Erebos' Dismissal
{b}{b}
 
 C 
Instant
Counter target non-Enchantment spell unless its controller pays 5 life.
"Lies"
Swamp
 
 B 
Basic Land – Swamp

Jasconius Archipelago (rare)
Brutality (uncommon)
Saffiyah's Summons (uncommon)
Curse of the Albatross (uncommon)
Spear Barracade (common)
Get A Clue (common)
Oilscale Eidolon (common)
Wardshell Tortoise (common)
Roil Twister (common)
Teferi's Visions (common)
Wyluli Spirit Guide (common)
Rabian Raider (common)
Purple Haze (common)
Erebos' Dismissal (common)
Swamp (basic)