The key card is present but its support is thin.
Prioritize useful support such as Champion of Dusan or Adorned Crocodile.
After Crocodile trades, renew it onto a creature with Successor present. If it is that creature’s first counter event of the turn, Successor adds another counter.
Your deck already enables the plan but is losing the early turns.
Take a castable early creature or efficient answer before a second expensive payoff.
Successor checks the first counter event for each creature each turn. Repeated counter additions to the same creature do not repeatedly double the reward.
The support is missing
Favor independently useful creatures and interaction if the narrow support does not arrive.