Bold Biochemist is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Power-up —: Put a +1/+1 counter on this creature and draw two cards. (Activate each power-up ability only once. Reduce the cost by its mana cost if it entered this turn.)
Complete guide
Bold Biochemist is an efficient Human Scientist that brings both research and muscle to your deck. With its unique Power-up ability, it can evolve from a simple utility creature into a significant threat while refilling your hand.
Understanding Power-up
Power-up is a keyword representing an activated ability that can be used exactly once. Bold Biochemist allows you to pay a mana cost to place a +1/+1 counter on itself and draw two cards. A key strategic element is the cost reduction: if Bold Biochemist entered the battlefield during the current turn, you subtract its mana cost from the Power-up cost. For this card, that means the cost drops from 5U to just 4.
Step-by-Step Resolution
First, you verify that you have not activated this specific creature's Power-up ability previously. Second, you determine the cost; if it's the turn it entered, you pay 4 mana, otherwise you pay 5U. Once the ability is on the stack and resolves, you place one +1/+1 counter on Bold Biochemist. Finally, you draw two cards. Because the counter and the draw are part of the same resolution, no one can act between you gaining the counter and drawing the cards.
Common Mistakes
Players often forget that Power-up is limited to once per permanent. If Bold Biochemist leaves the battlefield and returns, it is considered a new object and can be Powered-up again. Additionally, remember that the cost reduction only checks if the creature entered the battlefield this turn, not how it entered—whether cast from hand or put into play by an effect, the discount applies.
Strategic Timing
While it is tempting to use the Power-up immediately to benefit from the discount, Bold Biochemist can be activated at instant speed. You can hold your mana open for potential responses and activate the ability on your opponent's end step to ensure you start your next turn with a fresh hand and a stronger creature.
Interaction examples
On turn three, you can tap Ornithopter of Paradise for mana to help pay for Bold Biochemist. If you have four mana available total that turn, you can cast the Biochemist and immediately activate its Power-up for the discounted price of 4 mana because it just entered the battlefield.
While Foundry Inspector reduces the cost of artifact spells, it does not reduce the Power-up cost of Bold Biochemist since the Biochemist is a colored creature spell, not an artifact. You must rely on the Power-up's own built-in discount for efficiency during the turn it is played.
If Bold Biochemist has been on the battlefield for several turns, you must pay the full price of 5U to activate its Power-up. Upon resolution, it grows to a 2/2 creature and you draw two cards, providing late-game card advantage when resources are low.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Bold Biochemist
Original English text — Wizards of the Coast / Scryfall
No additional ruling has been published for this card.
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Meta decks with Bold Biochemist
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Ornithopter of Paradise
Foundry Inspector