First Come, First Served

Enchantment, 1W (2)
The attacking or blocking creature with the lowest collector number has first strike. If two or more creatures are tied, they all have first strike.¹
The Yotian soldiers hoped that one day R&D would make an artifact creature whose name starts with Z. And in their dreams, it's a 4/1.
Illus. Thomas Gianni

Crystal Keep Rulings Summaries

• Token creatures do not have collector's numbers. And some cards may be misprinted without a number and thereby have no number as well. [Unhinged FAQ 2004/11/15]
• If neither creature has a number, no creature gets a bonus. [Unhinged FAQ 2004/11/15]
• All tournament formats have banned cards from Unhinged.
• Note - Also see Collector Number, Rule 211.
• Note - Also see First Strike, Rule 502.2.

Format Legality	Banned in Vintage, Legacy, Extended, Standard
Printings (1/1)	Unhinged (Uncommon)