Don't worry about tapping your entire board state as needed, Merrow CommerceMerrow Commerce untaps each Merfolk at the end of your turn
For example, a card with a Cumulative Upkeep of 1 requires you to spend 1 mana on your first upkeep, then 2 on your second upkeep, then 3 on your third upkeep and so on
I like where Padeems heads at, but it mostly just looks like a worse Rashmi
ILLUSTRATOR Volkan Baa LEGALITIES Standard Future Historic Timeless Gladiator Pioneer Modern Legacy Pauper Vintage Penny Commander Oathbreaker Standardbrawl Brawl Competitivebrawl Alchemy Paupercommander Duel Oldschool Premodern Predh Tlr LANGUAGES EN FR DE IT JP KR PT RU ES ZH-CN ZH-TW Best Deal-Add item to your CardTrader Zero cart
20 Years Of Magic: The Gathering, A Game That Changed The World , archived from the original on May 22, 2014, retrieved August 11, 2013 "Making Magic, Stages of Design"