Creatures you control get +1/+0 and have vigilance as long as you control three or more creatures.Creatures you control also get +1/+0 and have trample as long as you control six or more creatures.Creatures you control also get +1/+0 and have double strike as long as you control nine or more creatures
Then put X +1/+1 counters on each creature you control, where X is the number of cards in your hand
However, it's a casual format, and many playgroups will allow the inclusion of a "wishboard," which is usually a single card you can wish for
Ultimately, I decided on this card because it comes down to instant competitive viability, and Koraidon is likely to be an instant inclusion in Raging Bolt ex [Twilight Masquerade] - one of the best decks in our current Standard format
Let me know on Twitter at @bradleyrose
He was playing different versions of Goat Control featuring Royal Decree and Zaborg the Thunder Monarch