Its relatively cheap, it provides repeatable self-mill on attack triggers, and it helps to pay off other graveyard synergies by creating creature tokens
Now, everyone knows Zirda can do busted things with Basalt Monolith or Grim Monolith to generate infinite colorless mana, and thats certainly wild the first time you do it, but lets face it, easy-mode Magic gets boring fast
Less of a language is printed means less errors get out making them more rare/obscure
If heads, this Pokemon can do 30 more damage
If you are building decks with the cards you own, you will want to organize your collection in such a way that you can readily find the cards you have that do particular things
Any cards that are "E" regulation or newer, or have been reprinted in these sets, will remain legal for tournament play