Harmless Offering, one of the few Donate effects in the game, just got a reprint in Foundations
Magmortar Ability: Magma Aura Put 3 more damage counters on your opponent's Burned Pokemon during Pokemon Checkup
If your third spell has the Cascade keyword, add it to the Stack, finish resolving the previous Stack trigger, resolve the third Cascade, and then resolve the spells in a similar order as shown above
Making your opponents lands islands is generally a good move because lots of merfolk naturally have Islandwalk
The card draw clause pretty much guarantees that youll never run out of auras to play (assuming youre building your deck with lots of them), and the +2/+2 clause means that youll have a giant creature to attack your opponent with
Their fusion materials were highly restrictive, Fossil Fusion needed to banish materials from both graveyards to activate, and the card lacked search and recycling options, compared to Invoked's streamlined fusion materials, ability to fuse using only a single GY, and their fusion card being highly searchable and self-recycling