Simply put: anything which lets you avoid paying mana for effects you normally spend mana on is extremely powerful
ChefXiru noted Yeah, thats gotta be lightly played. Butthunter_Sua took the joke even further: A rat stopped mid way through its meal to send you this and youre not even appreciative. Safe to say, the condition on this leak isnt too impressive
[200] Its popularity often was associated with addictive behavior similar to gambling through the allure of gaining new cards in booster packs and expansions, and due to this, Magic: The Gathering has been sometimes called "cardboard crack" by both fans and critics
Luffy is the single most impactful leader released in OP-11, warping the competitive meta around its Blue/Purple Straw Hat Crew engine
We can imagine that, in the future, a card with the Battle type that its own controller needs to protect from to gain a recurring benefit, but with a severe punishment if it leaves play, may arise
But there were rules