This elegant loop transforms the humble Treasure tokens generated by Rapacious Dragon into an endless engine of blinking and mana production. While Emiel the Blessed normally demands a hefty three-mana investment to flicker a creature, Training Grounds steps in to slash that activation cost down to just a single mana. Because the Dragon replaces your investment by dropping two Treasures upon re-entry—each of which sacrifices for the exact mana needed to keep the cycle spinning—you can repeat this process indefinitely to amass infinite tokens and trigger any entering-the-battlefield effects you desire.