Activate only if two or more Elf cards are in your graveyard
Honestly, this answer is going to vary from day to day and set to set
The key to making a set care about a particular card type is to get the as-fan of that type up, and including it on creatures is an easy way to do that
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Notes and Rules Information for Cloud, Midgar Mercenary: Triggered abilities use the word "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]." Some keyword abilities are triggered abilities and will have "when," "whenever," or "at" in their reminder text
I may play this in place of having no Smith or perhaps in the SB for those kinds of matchups
You are the strongest link