Whenever equipped creature deals combat damage to a player, put a +1/+1 counter on a creature you control, then proliferate
The best way I know for figuring out what the 20% actually are is by fully understanding the interactions between all of the cards not just the ones that look good at first glance
Simply, he wants a Level 35 Electabuzz card for his special rare Electabuzz promotional card At the table in the lobby in the Psychic Club, you will find Pappy, who will offer you a very rare promotional card once you have defeated Murray, the Club Master
Finally, if you have some way of untapping a bunch of Creatures, they can be used multiple times, which has its own value
When its special summoned, you can draw a ritual/polymerization card to set up future plays
Three simple words that change the game long term creatures cant block