What this 3 monster SPLINTERLANDS Cards have in common?

What this 3 monster #SPLINTERLANDS Cards have in common? Comment below.

1. GOBLIN FIREBALLER

2. KOBOLD MINER

3. ANT MINERS

"Thanks for the upvotes guys, please comment below your thoughts."

PLEASE SAVE MY GAMING CARRIER

Splinterlands @aryt

DM me on Discord @ ARYT#7544

SPECIAL THANKS TO:

@notak#3310
@markjason#5541
@homesteadhacker#7187
@mad-runner