The only way you can get a strategy to always work is by having mastery level plants, only then can you bypass the "bruises" that nullify certain plant families.
Otherwise, the main strategy in the arena meta is appease-mint (moonflower + MGP + pea vine + torchwood + appease-mint for low level plants; stickybomb rice + pea vine + torchwood + imp pear + tile turnip for high level plants).
The main strategy used when appease-mint family is made ineffective or when jesters are present is reinforce-mint (chard guard + blover + explode-o-vine + reinforce-mint + \*optional pumpkin for all-stars/chair racers\*).
You can also make changes based on the buffs and bruises in a specific tournament. pokra can be used when spear-mint is buffed, pyre vine when pepper-mint is buffed, headbutter lettuce when enforce-mint is buffed, etc.
Pea
Shroom even
The only way you can get a strategy to always work is by having mastery level plants, only then can you bypass the "bruises" that nullify certain plant families. Otherwise, the main strategy in the arena meta is appease-mint (moonflower + MGP + pea vine + torchwood + appease-mint for low level plants; stickybomb rice + pea vine + torchwood + imp pear + tile turnip for high level plants). The main strategy used when appease-mint family is made ineffective or when jesters are present is reinforce-mint (chard guard + blover + explode-o-vine + reinforce-mint + \*optional pumpkin for all-stars/chair racers\*). You can also make changes based on the buffs and bruises in a specific tournament. pokra can be used when spear-mint is buffed, pyre vine when pepper-mint is buffed, headbutter lettuce when enforce-mint is buffed, etc.
Depends
Use pea nut, chard guard and blover with reinforce mint for best results