Attentive Sunscribe + Arwen Undómiel + Crystalline Crawler + Freed from the Real + Branching Evolution

Attentive Sunscribe

Arwen Undómiel

Crystalline Crawler

Freed from the Real

Branching Evolution

How it works

1. Activate Freed from the Real's first ability by paying , tapping Attentive Sunscribe.
2. Attentive Sunscribe triggers, causing you to scry 1.
3. Arwen Undómiel triggers, putting two +1/+1 counters on Crystalline Crawler.
4. Activate Crystalline Crawler's first ability twice by removing two +1/+1 counters from it, adding .
5. Activate Freed from the Real's second ability by paying , untapping Attentive Sunscribe.
6. Repeat.

This loop is a masterclass in recursive counter generation, anchored by enchanting Attentive Sunscribe with Freed from the Real to repeatedly tap it for blue mana. Each time the Sunscribe taps, its triggered ability lets you scry 1, which in turn triggers Arwen Undómiel to place a +1/+1 counter on Crystalline Crawler. Because Branching Evolution doubles any counters put on your creatures, Arwen's single scry trigger actually places two counters on the Crawler instead of one. You then strip those two newly placed counters right back off the Crystalline Crawler to generate the exact {U}{U} needed to pay for Freed from the Real's tap and untap costs, netting you an infinite loop of scries, counters, and mana.