mega dragonite ex pokemon card 290/217 SIR Ascended Heroes Extended Artwork Case Card Number / Rarity A photo has surfaced showing

usage, and repeated pressure into a board that can snowball before the opponent is ready

Several cards care about casting creatures or creatures with certain attributes, so tutor for something good to trigger Silverback Elder or Kozilek's Unsealing

Note the reminder text after the Exhaust ability is described on the card: "Activate each exhaust ability only once." Not all Exhaust cards involve +1/+1 counters, although this seems to be a popular choice by Wizards

But he has also played with the deck several times

Harbin, Vanguard Aviator There was a time where a 3/2 flier needed to cost 3-4 mana to be fair, but here we are