At a cost of seven Ink, it isnt cheap to play, but if you have a character that costs seven or more on the field, you can tap it to play Be Prepared without paying its Ink cost
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You must still follow any relevant timing rules for the non-Adventure spell you cast from exile
The window for hitting 5 mana for the activated ability is very short and makes the growth on your team impossible to ignore this +1/+1 counter commander
That means it's the only trigger that can easily be done more than once, and, again, you are in the color of that ability
This one also costs 4 mana which is something Bello can use to aggravate your opponents with