Creatures:
- 4 Delver of Secrets
- 4 Young Pyromancer
- 3 Monastery Swiftspear
- 2 Bedlam Reveler
Spells:
- 4 Lightning Bolt
- 4 Gitaxian Probe
- 4 Opt
- 2 Vapor Snag
- 2 Cryptic Command
- 2 Spell Pierce
- 1 Forked Bolt
Lands:
- 4 Scalding Tarn
- 4 Steam Vents
- 2 Flooded Strand
- 2 Island
- 2 Mountain
- 1 Spirebluff Canal
- 1 Sulfur Falls
Sideboard:
- 2 Blood Moon
- 2 Abrade
- 2 Damping Sphere
- 2 Dismember
- 2 Spell Snare
- 2 Negate
- 1 Anger of the Gods
- 1 Fracturing Gust
This is an example of a UR Delver, a fast and aggressive archetype that has been a staple of the Modern metagame for a while. It relies on cheap spells to power out early threats, while countering and removing opponents plays.
Cards like Delver of Secrets and Young Pyromancer are powerful and efficient threats, while Gitaxian Probe and Opt help to filter through your deck and find the right cards. Cryptic Command and Spell Pierce are versatile spells that can help you to control the board and protect your threats.
The sideboard gives you a set of cards that can combat against different strategies and metagames, like Blood Moon to shut down tron and Valakut strategies, Abrade and Dismember as removal against big artifact and creatures, Damping sphere and Negate as counterspells and Spell Snare to combat against specific spells.
Keep in mind that the prices of the card fluctuates, and it’s important to keep track of the market values to optimize the cost of the deck, and also that this is a general example, and as always, playing test is important.
Let me know if you have any more question or if there’s anything else I can assist you with.