Iron Arm Dragon, Gargrex

[AUTO]:When this unit is rode upon by "Iron Emperor Dragon, Gargrex", [COST][Energy-Blast 3], look at the top seven cards of your deck, choose up to two <Dinodragon> with different card names from among them, reveal them, choose a card from among the revealed cards, put it into hand, discard the rest of the revealed cards, and shuffle the deck. [ACT](Drop):If you have a grade 3 or greater <Dinodragon> vanguard, [COST][Energy-Blast 3], and call this card to (RC).