If you put it over the Selkie, then the resulting merged creature is Otrimi, the Ever-Playful a 6/6 creature with trample and Otrimi's triggered ability, but it also has the Selkie's islandwalk and triggered ability
The speed of the game makes it hard to find the time for a card that doesn't directly impact the game, but the real problem was that a lot of cards started using their graveyards for fun and profit, much more so than in the past
This one ran across a cycle of gotcha cards that each had two words in their names that you got gotcha'ed if you said either of them (gotcha was a mechanic that allowed you to get cards back from the graveyard if you caught the opponent doing a prescribed thing and yelled out "Gotcha!")
Meanwhile their mnemomages have infiltrated the sewers of each of the major cities
Vanishing A permanent with vanishing enters with several time counters
Fetching two lands is the going rate for 4 mana, and fetching two cards with the forest subtype means this green sorcery can do some serious fixing by grabbing dual lands or even Triomes