+heralds (5)
, : Draw a card.
When Forerunner of the Heralds enters, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on top.
Whenever another Merfolk you control enters, put a +1/+1 counter on Forerunner of the Heralds.
Flying
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)
Colorless spells you cast with mana value 7 or greater cost less to cast.
Other colorless creatures you control get +1/+1.
Put a +1/+1 counter on target creature and a +1/+1 counter on up to one target Merfolk.
Gatherer works better in the Companion app!