Scion Summoner [Oath of the Gatewatch] SPA Mago de tesoros and why did he feel

and why did he feel so stiff

Set: Prophecy Type: Instant Rarity: Rare Cost: {8}{G} Creatures you control get +7/+7 until end of turn

Set: Return to Ravnica Type: Sorcery Mythic Cost: {X}{U}{R} Exile the top X cards of your library

the Coalition Type: Legendary Creature — Dragon Rare Cost: {3}{R}{G}{W} Flying Whenever Rith

Scion Summoner [Oath of the Gatewatch] SPA Mago de tesoros and why did he feelSet: Oath of the Gatewatch Type: Creature Eldrazi Drone Common Cost: {2}{G} Devoid (This card has no color.) When Scion Summoner enters the battlefield, create a 1 1 colorless Eldrazi Scion creature token. It has "Sacrifice this creature: Add {C}." ({C} represents colorless mana.)