No matter how many times you heal your opponent's minion, you may only add 3 to
Hrethel's strength (that's what "limit +3" means)
What does
Larder have to do with adding to
Hrethel's strength?
Just for fun, I'll run through a little scenario:
Hrethel vs
Shelob, Eater of LightOn table:
Web x4 (each with 3 minions stacked),
Larder x4 (each with 2 tokens)
Hrethel is bearing
Swift Steed.
FP Player assigns
Shelob EoL to skirmish
Hrethel.
Skirmish begins. (
Hrethel 6 Strength vs Shelob 44 Strength (+3 str for each minion stacked on a Gollum possession: 12 x 3 = 36 + base strength 8 = 44)
At the start of the skirmish, Shelob exerts due to
Swift Steed.
FP Player has first action: Uses
Hrethel's text to heal Shelob to add 3 to his strength. (9 vs 44)
SP has next action: Uses
Larder's text, discarding a token to make Shelob str +3. (9 vs 47)
FP has no more actions.
SP continues using each
larder's text, removing all tokens to add 21 more strength to Shelob. (9 vs 68)
FP Player passes.
SP passes.
Hrethel is overwhelmed and killed. Skirmish ends.