if you have gained life, an Infusion spell will only be cast with its Infusion effects
In the past few years, notably since Strixhaven, we have seen a pattern of stronger mid-game cards and thats leading to the player who skips past the early game being able to snowball their advantage straight through to the win
The downtick can be hit or miss in decks without lots of cheap ways to get cards in the graveyard
The ones that go for more than $10 are: The Verdict Elf typal is always a super safe bet for a deck
Seahunter itself costs 4, so we can't start all the way down the Mercenary pecking order, but Cateran Enforcer does specialize in fetching 4-mana Mercenaries, and it has the good sense to cost 5 itself, making it unfetchable by its own effect (in contrast, Rebels search up the mana cost line, and every creature with a Rebel-fetch ability is capable of fetching copies of itself, so all of them are out of bounds)