pokemon professor kukui card (Full Art) - SM Base Set Violet Black Star Promos Professors Research Trainer Professor Kukui - Sun &

Whenever a land enters the arena under his control, he will gain 4 life

And before you ask, no, it wasnt just because of some other broken card or cards

Reselecting which player or permanent a creature is attacking ignores all requirements, restrictions, and costs associated with attacking

And if the equipped creature is an artifact creature, you could even tap it and its equipment to pay two generic mana via improvise

If it enters the battlefield untapped, the ability won't trigger, even if you tap that permanent afterward

That brings us to the other, probably more important reason we think this card is great in the deck