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Seeds of Strength has the following text:
Target creature gets +1/+1 until end of turn.
Target creature gets +1/+1 until end of turn.
Target creature gets +1/+1 until end of turn.
Sage of hours reads
Heroic — Whenever you cast a spell that targets Sage of Hours, put a +1/+1 counter on it.
So would Seeds of Strength trigger the heroic once or three?
Only once. The actual trigger condition is "whenever you cast a spell...". And there was only 1 instance of "cast a spell" happening.
IF the ability said "whenever a spell targets Sage of Hours..." then it would happen 3 times.
See the Gatherer ruling on Sage of Hours:
Heroic abilities will trigger only once per spell, even if that spell targets the creature with the heroic ability multiple times.
