Yoshimaru also cares about legendary permanents entering the battlefield, meaning that legendary lands, artifacts, enchantments, and more often found in Magic: The Gathering's Secret Lairs and elsewhere will all trigger its ability, growing him to massive sizes
There seems like thered be too many instances of having Sylvia Brightspear on the field and a hand of knights, or Khorvath Brightflame on the field with a field full of dragons (that's rarely a bad thing, but I think Ive made my point)
Crossovers with The Lord of the Rings , Warhammer 40,000 , Final Fantasy , and Assassins Creed brought hundreds of unique cards to the game while attracting fans from other franchises
The other downside to this one is that unless you can remove it, you are obligated to pay the life and draw a card, so it is possible to lose to your own Phyrexian Arena