I think its a way artists or collectors can express themselves, but I have rarely found custom cards (or customized cards) as Ill show below that actually pass my personal bar of quality
(Forecast only during your upkeep and only once each turn.) ClockworkSwordfish on Double exalted 3 years ago Between the Aven Sunstrikers and Skyhunter Skirmisher, you probably have enough double strikers that you need a full four Grappling Hooks
For five mana (one of each color) you can untap all attacking creatures and give them trample, lifelink, and haste and gives you an additional combat phase after that one
This is a great surprise factor, and since it's a Quick Effect it can catch an attacking opponent off guard
*During this review process, illustrations are examined to make sure that they fit within the Pokmon universe in design and atmosphere, and ideas are also suggested to make them more Pokmon-like. A : The most common feedback I get is about the Pokmons shape