Activate a block by landing on it

Its easy. At the Block Dimensions, set the Y coord to: min = 0; max = 0.9

And then, at the Events, Add a new event in the 'When mob/player colides block' part.

The only issue is that if you shot an arrow to the block, it will activate the Event

Now I finally know why collide events don't work! They don't work because I need to change the dimensions.
The arrow activates the event because it's an entity.