Abiding Grace Abuelo's Awakening Against All Odds Ajani, Adversary of Tyrants Angel of Indemnity Anti-Venom, Horrifying Healer Archon of Falling Stars Astelli Reclaimer Auramancer Auriok Survivors Battle of Hoover Dam Bishop of Rebirth Breath of Life Brotherhood Outcast Bruna, the Fading Light Builder's Talent Call a Surprise Witness Cavalier of Dawn Celestine, the Living Saint Cleric Class Custodi Soulcaller Daring Archaeologist Dauntless Avenger Daydream Defy Death Devoted Crop-Mate Dewdrop Cure Disciple of the Sun Doctor Jane Foster Elspeth Conquers Death Emerge from the Cocoon Excavation Elephant Extraction Specialist False Defeat Forum Filibuster From the Rubble General Leo Cristophe Griffin Dreamfinder Gryff's Boon Guardian Scalelord Harnessed Snubhorn Helping Hand Heroic Return Immortal Obligation Ironclad Slayer Ironsoul Enforcer Jackdaw Savior Jolted Awake Karmic Guide Late to Dinner Loran, Disciple of History Lotus-Eye Mystics Loyal Retainers Master Skald Meanders Guide Miraculous Recovery Momentary Blink Monk Idealist Oltec Archaeologists Onakke Oathkeeper One Last Job Order of Whiteclay Phoenix Down Phyrexian Missionary Pillardrop Rescuer Pre-War Formalwear Proclamation of Rebirth Pulsemage Advocate Razor Hippogriff Recommission Redemption Choir Rescue Skiff

Valley Floodcaller and Valley Mightcaller are additional frog payoffs that branch off into different creature types found in Bloomburrow
Its also worth noting that, if you cast this in your main phase, the effect lasts until the end of the turn
Urza, Planeswalker Urza, Planeswalker is an absolute bomb, and thats because you need both Urza, Lord Protector and The Mightstone and Weakstone on board before you pay the seven mana to meld them
There is an exception for powerful cards in the Standard format, though
Braids, Conjurer Adept