This clever loop transforms Athreos, Shroud-Veiled into an unyielding engine by turning its coin-counter recursion into a closed circuit. When you leverage Blue, Loyal Raptor's passive ability, any Dinosaur you cast enters the battlefield bearing a coin counter, perfectly setting up Athreos to trigger the moment it leaves. You then feed that creature to Bartolomé del Presidio, whose sacrifice outlet not only triggers the recursion but pumps up its own size with +1/+1 counters along the way. Because Athreos immediately returns the fallen Dinosaur straight back to the battlefield—where Blue, Loyal Raptor promptly clothes it in another coin counter—the sacrifice can happen all over again, fueling an endless cascade of triggers.