Primal Vigor Another one of the green token doublers MTG has printed is Primal Vigor

Ben 10 Very good 19.99 Ben 10 Good 2.90 Ben 10 Very good 5.30 Ben 10 Very good 25.00 Ben 10 Very good 20.00 Ben 10 Very good 3.00 Ben 10 Very good 5.00 Ben 10 New without tags 14.00 Ben 10 Very good 12.00 Ben 10 Very good 5.00 Ben 10 Very good 4.00 Ben 10 Very good 30.00 Ben 10 Very good 25.00 Ben 10 Good 5.00 Ben 10 Very good 8.00 Ben 10 Good 20.00 Ben 10 Good 5.00 Ben 10 Good 5.00 Ben 10 Very good 5.00 Ben 10 Very good 7.99 Ben 10 Very good 2.00 Ben 10 Satisfactory 10.00 Ben 10 Satisfactory 4.00 Ben 10 Very good 7.00 Ben 10 New without tags 2.00 Ben 10 Very good 2.00 Ben 10 Very good 4.20 Ben 10 Good 1.00 Ben 10 Very good 6.50 Ben 10 Very good 1.00 Ben 10 Very good 1.00 Ben 10 Good 1.00 Ben 10 Very good 2.00 Ben 10 Good 5.00 Ben 10 Very good 13.00 Ben 10 Good 4.00 Ben 10 Very good 4.00 Ben 10 Good 13.00 Ben 10 Very good 1.50 Ben 10 Good 6.00 Ben 10 Good 1.00 Ben 10 Good 1.00 Ben 10 Satisfactory 4.00 Ben 10 Very good 25.00

The equipped creature gets +1/+1 for each creature we control with base power or toughness of 1, and whenever a Hamster, Mouse, Rat, or Squirrel enters we can equip the Sword for free
But hey, its a Fighting-type card, so Lucario (Space-Time Smackdown) works
And flicker shenanigans allow you to get a ton of value out of this card by finding more and more creatures since this is an enters-the-battlefield ability
TYPE Legendary Artifact Creature Equipment Jellyfish ABILITY You may look at the top card of your library any time