Aeronaut Tinkerer has flying as long as you control an artifact. (It can't be blocked except by creatures with flying or reach.)

Magic.Wizards.com

• Number: 43*
• Rarity: P
• Power: 2
• Toughness: 3
• Type: Creature
• Subtype: Human Artificer
• Mana cost: 2U
• Color: Blue
• Artist: Willian Murai