Fists of Ironwood
Enchantment — Aura
Enchant creature
When this Aura enters, create two 1/1 green Saproling creature tokens.
Enchanted creature has [[ keyword: "trample" ]].
Saprolings add the three and the four to the "one-two punch."
Glen Angus
Ravnica Remastered (RVR)
• #139Rulings
The Saproling tokens aren't created until after Fists of Ironwood is on the battlefield, so you can't cast Fists of Ironwood on one of those tokens.
(wotc • 2017-03-14)
If the target creature is an illegal target when Fists of Ironwood tries to resolve, Fists of Ironwood won't resolve and won't enter the battlefield. You won't create Saproling tokens.
(wotc • 2017-03-14)
You create the Saproling tokens, even if Fists of Ironwood enters the battlefield attached to another player's creature.
(wotc • 2017-03-14)
Rulings
The Saproling tokens aren't created until after Fists of Ironwood is on the battlefield, so you can't cast Fists of Ironwood on one of those tokens.
(wotc • 2017-03-14)
If the target creature is an illegal target when Fists of Ironwood tries to resolve, Fists of Ironwood won't resolve and won't enter the battlefield. You won't create Saproling tokens.
(wotc • 2017-03-14)
You create the Saproling tokens, even if Fists of Ironwood enters the battlefield attached to another player's creature.
(wotc • 2017-03-14)