From MTG Salvation Wiki
Reinforce is an activated ability that functions only while the card with reinforce is in a player’s hand. It was introduced in Morningtide.
From the Comprehensive Rules:
- 702.75. Reinforce
- 702.75a Reinforce is an activated ability that functions only while the card with reinforce is in a player’s hand. “Reinforce N—[cost]” means “[Cost], Discard this card: Put N +1/+1 counters on target creature.”
- 702.75b Although the reinforce ability can be activated only if the card is in a player’s hand, it continues to exist while the object is on the battlefield and in all other zones. Therefore objects with reinforce will be affected by effects that depend on objects having one or more activated abilities.
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[edit] Example
- Mosquito Guard -
Creature — Kithkin Soldier
1/1
First strike
Reinforce 1 —  (, Discard this card: Put a +1/+1 counter on target creature.)
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[edit] Color percentages
There is a total of 7 cards that involve reinforce, which divide by color as such:
- White = 43 %
- Green = 29 %
- Red = 14 %
- Land = 14 %
