In my experience of building a Magic: the Gathering aggro deck, the range of my creature count is around 25 to 30 while also considering the creature curve as to how it would be efficient and fast in your starting hand draws.

The ideal creature count in an aggro deck in Magic: The Gathering can vary depending on the format, strategy, and specific cards you’re using. However, there are general guidelines you can follow to ensure your deck maximizes speed and aggression, the core tenets of any aggro strategy.

Key Considerations:

Creature-Heavy Decks:

• Aggro decks generally aim for 25 to 35 creatures in a 60-card deck. This ensures that you consistently have early threats to play and can apply pressure on your opponent from the very first turns.
• For example, Mono-Red Aggro in Standard often has 26-28 creatures, while White Weenie might push upwards of 30 creatures to overwhelm the opponent with low-cost threats.

Low-Curve Creatures:

• Aggro decks thrive on early aggression, so having a high number of 1- and 2-drops is crucial. 1-drops should make up a significant portion of the deck (around 8-12 creatures) to ensure you can start attacking early.
• 2-drops are usually the backbone of the deck (another 8-12 creatures). Together, these low-cost creatures should provide the bulk of your creature count.

Utility and High-End Creatures:

• Most aggro decks still run a few high-impact creatures at the 3- or 4-mana range. These creatures often act as finishers or game-changers (e.g., Questing Beast or Adeline, Resplendent Cathar). It’s common to see 3-6 of these in an aggro deck to provide late-game punch.

Balancing with Spells:

• While creatures form the majority of an aggro deck, you’ll typically want 6-10 non-creature spells to handle removal, burn spells, or combat tricks that can help push through extra damage or clear blockers.

Here below are example breakdown of creatures and non-creature spells in an aggro deck build.

• Mono-Red Aggro in Standard:
• Creature count: 24-28
• Non-creature spells: 8-10 (typically burn and pump spells)
• White Weenie Aggro:
• Creature count: 30-32
• Non-creature spells: 6-8 (buffs, removal, or protection)

Tuning Based on Format:

• In formats like Modern or Legacy, the creature count can vary slightly depending on the presence of combo elements or support cards like burn spells.
• Commander decks can also see aggro strategies, but creature counts might be lower (around 20-25) due to the slower pace and multiplayer environment.

Conclusion:

While the ideal creature count for an aggro deck is around 25 to 35 creatures, it ultimately depends on the mana curve, support spells, and the format you’re playing in. Balancing an aggressive early game with a few powerful finishers is key to a successful aggro deck.