25th Anniversary Cube: 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 
Land – Forest Plains
({t}: Add {g} or {w}.)
As ('Kamigawa GW Dual-Land') enters the battlefield, you may reveal a Spirit or Arcane card from your hand. If you don't, ('Kamigawa GW Dual-Land') enters the battlefield tapped.
Concept of Kamigawa Kitsune area.
 U 
Land
{t}: Add {c}.
{1}, {t}, Sacrifice (RW Panorama): Search your library for a Mountain or Plains card and put it onto the battlefield tapped. Then shuffle your library.
 U 
Sorcery
Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn.
Storm (When you cast this spell, copy it for each spell cast before it this turn.)
""
 U 
Instant
(put +1/+1 counters on things, bolster?)
Fuse (You may cast one or both halves of this card from your hand.)
(UG U Fuse)
{1}{u}
 
Sorcery
Proliferate (You choose any number of permanents and/or players with counters on them, then give each another counter of a kind already there.)
 C 
Instant – Arcane
Remove a counter form target permanent.
Splice onto Arcane {b} (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)
 C 
Creature – Spider
Deathtouch, Reach
Poisonous 1 (Whenever (Venomous Placename Spider) deals combat damage to a player, that player gets a Poison counter. A player with ten or more poison counters loses the game.)
1/1
 C 
Creature – Spirit
Enables Aggro and Soulshift. Maybe minor secondary effect?
2/1
 C 
Sorcery
Detain up to one target artifact and up to one target creature. (Until your next turn, those permanents can't attack or block and their activated abilities cannot be activated.)
Investigate (Create a colorless Clue artifact token with "{2}, Sacrifice this artifact: Draw a card.")
 C 
Creature – Changeling
 C 
Creature
1/3
 C 
Creature – Shapeshifter
Changeling (This card is every creature type.)
 C 
Artifact Creature – Phyrexian
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
Modular 1 (This enters the battlefield with a +1/+1 counter on it. When it dies, you may put it's +1/+1 counters on target artifact creature.)
0/0
 C 
Enchantment – Aura
Flash
Enchant Creature
Enchanted creature gets +2/+2.
Vanishing 2 (This creature enters the battlefield with two time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
 C 
Creature – Dwarf Berserker
At the beginning of your upkeep, you may Clash with an opponent. If you win, Dwarven Pitfighter gets +1/+1 until end of turn. (Each clashing player reveals the top card of his or her library, then puts that card on the top or bottom. A player wins if his or her card had a higher converted mana cost.)
1/1
Forest
 
 B 
Basic Land – Forest

('Kamigawa GW Dual-Land') (rare)
(RW Panorama) (uncommon)
(Storm Act of Treason) (uncommon)
(UG Fuse, in prog) // (UG U Fuse) (uncommon)
(Remove a counter splice) (common)
(Venomous Placename Spider) (common)
(one drop spirit) (common)
Consulate Questioning (common)
(WB Changeling, in prog) (common)
(filler small creature) (common)
(UB Changeling Cycle, in prog) (common)
Arcbound Vector (common)
('Flash Aura Pump Spell') (common)
Dwarven Pitfighter (common)
Forest (basic)