You can cast a creature spell for its dash cost only when you otherwise could cast that creature spell
If you are looking to invest in a Reserve List card thats going to have a high price tag initially, but I cant conceive will ever drop down, The Abyss is it
Effects like the Historic banned Spreading Seas can fix this and, since Islandwalk is a recurring mechanic across Merfolks, it is probably worthwhile running some effects like that, making Master of the Pearl Trident an absolute menace
Play your first non-commander card after like nine turns of just putting down lands
You might have to splash a colour just to play it, but with Treasures going around, it shouldnt be that hard to do
Due to how this ability is worded, milling several creatures at once only nets its controller one zombie token, so a Sidisi deck benefits from include numerous ways to mill small numbers of cards, as to create a massive zombie army