This is a very aggressive ability that wants the player to attack as much as possible and to cast spells/activate abilities during combat
Some of the vast range of abilities include effects like: Banish a character or item Damage or heal a character Draw cards, or look at the top few cards of your deck Gain Lore or steal your opponents Lore Exert an opponents character or ready one of yours There are many more, and different ink colors tend to have more of certain abilities
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You dont want to put this on your battlefield if youre already behind in lands and ramp because those are minimal costs to pay for your opponents to deny you known card advantage
So in summary: power, synergy, flexibility, and reliability