Serum Sovereign
Creature — Phyrexian Sphinx
Flying Whenever you cast a noncreature spell, put an oil counter on this creature. {U}, Remove an oil counter from this creature: Draw a card, then scry 2.
Mana cost
4
U
Mana value
5
Printings
From
$0.27
EDHREC rank
#12895
Buy
Formats
Pioneer
Legal
Modern
Legal
Legacy
Legal
Vintage
Legal
Commander
Legal
Rulings
4 Feb 2023
Removing an oil counter is part of the cost to activate Serum Sovereign's last ability. Players can't respond with a spell or ability that removes counters to prevent you from drawing a card and scrying 2.

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