CML leaks: Virtual Booster
You could alternatively have a booster in the usual rarity pattern.
 , Tap X untapped artifacts you control: Look at the top X cards of your library. Put one of them into your hand and the rest into your graveyard.
Partner (You can have two commanders if both have partner.) 3/6
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Flying
Whenever another creature dies, put two +1/+1 counters on Sengir, the Dark Baron. Whenever another player loses the game, you gain life equal to that player's life total as the turn began. Partner (You can have two commanders if both have partner.) 4/4
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If The Prismatic Piper is your commander, choose a color before the game begins. The Prismatic Piper is the chosen color.
Partner (You can have two commanders if both have partner.) 3/3
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Choose any number of targets. For each of them, exile the top card of your library, then Soulfire Eruption deals damage equal to the converted mana cost of the exiled card to that target. You may play the exiled cards until the end of your next turn.
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When Ich-Tehik, Scrap Splicer enters the battlefield, create a 3/3 colorless Golem artifact creature token.
Whenever an artifact is put into your graveyard from the battlefield, put a +1/+1 counter on Ich-Tehik and on each Golem you control. Partner 1/1
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When Eyeblight Clubber dies, create three 1/1 green Elf Warrior creature tokens and mill three cards.
3/3
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As a card enters exile, note its converted mana cost.
Bell Borca, Spectral Sergeant’s power is equal to the highest number noted this turn. At the beginning of your upkeep, exile the top card of your library. You may play it this turn. */5
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Reach
Whenever another creature enters the battlefield under your control, you may pay  . When you do, that creature deals damage equal to its power to target creature.
Partner (You can have two commanders if both have partner.) 3/4
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As you cascade, you may put a land card exiled this way onto the battlefield tapped.
4/2
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Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)
7/7
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: Choose one. X is the number of spells you’ve cast this turn.
• Scry X. • Gnostro, Voice of the Rocks deals X damage to target creature. • You gain X life. 3/3
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At the beginning of your end step, create X 1/1 white Spirit creature tokens with flying, where X is the number of tokens you've created this turn.
3/4
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Whenever Forceful Recruiter or another Pirate enters the battlefield under your control, gain control of target creature until end of turn. Untap it. It gains haste and becomes a Pirate in addition to its other types until end of turn.
4/3
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Reach
Whenever another permanent enters the battlefield under your control, if it wasn't put onto the battlefield with this ability, you may put a permanent card with equal or lesser converted mana cost from your hand onto the battlefield. Partner (You can have two commanders if both have partner.) 6/6
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Flying
Spells your opponents cast that target commanders you control cost  more to cast.
Partner 1/3
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Glacian, Powerstone Engineer
(uncommon)
Sengir, the Dark Baron
(rare)
The Prismatic Piper
(common)
Soulfire Eruption
(mythic)
Ich-Tehik, Scrap Splicer
(uncommon)
Eyeblight Clubber
(common)
Bell Borca, Spectral Sergeant
(rare)
Halana, Kessig Ranger
(uncommon)
Averna, Blooming Chaos
(rare)
Maelstrom Colossus
(common)
Gnostro, Voice of the Rocks
(rare)
Thalisse, Dignified Medium
(uncommon)
Forceful Recruiter
(rare)
Kodama of the East Tree
(rare)
Esior, ____'s Familiar
(uncommon)