Sunken City, Blues answer to Bad Moon and Crusade, although it had an upkeep cost, was also discontinued after Fourth Edition
A neat little combo should your opponent miss the opportunity to take them out
Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owners control with a +1/+1 counter on it.) Let the world burn! Illustrated by Nereida Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
10 Common cards (in 33% of packs, one common is replaced by a traditional foil card of any rarity)
This pairs perfectly with both Madam Mim cards, which can return a character in play back to your hand when played, meaning you get to activate any Giant Cobra once again
This is in part due to the fact that it includes a three-card infinite combo with the cards Gatta and Luzzu, Walking Ballista, and Hardened Scales