Pumping your Merfolk creatures a bit and granting them a very powerful form of evasion with islandwalk means you are free to keep attacking so long as your opponent controls an island
The Enemy-Colored Check Land Cycle Although not technically the more powerful cards from the list, the check land cycle are the most versatile
These are full-art cards, meaning they have no border with more space for designs to cover, and have a striking holographic look as a result of the foiling
It triggers Sanctum of Ugin, allowing you to effectively chain World Breakers, since you will usually be able to cast the second one the next turn if you had the mana to get the first one down
This, like red, tends to be fairly straight forward and rather self-centered in its spells
Another notable upgrade is Soulstone Sanctuary, which adds more utility to the deck's mana base while supporting the archetype's core synergies