Cheapest priced copy (Modern Horizons 2): $0.35 at Card Kingdom, near mint, their price list as of .
Tide Shaper 
Creature — Merfolk Wizard · 1/1 · Uncommon · Modern Horizons 2 · #72
Kicker {1} (You may pay an additional {1} as you cast this spell.)
When this creature enters, if it was kicked, target land becomes an Island for as long as this creature remains on the battlefield.
This creature gets +1/+1 as long as an opponent controls an Island.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 2 | 72 | Uncommon | $0.35 | $0.49 |
| Modern Horizons 2 | 394 | Uncommon | $0.39 | $0.49 |
9 rulings from Wizards of the Coast
- 18 June 2021A land that becomes an Island gains "{T}: Add {U}" and loses all other abilities. It loses any other land types, but it doesn't lose any types or supertypes, such as creature, legendary, or snow.
- 18 June 2021If Tide Shaper leaves the battlefield before its triggered ability resolves, the target land will not become an Island.
- 18 June 2021Tide Shaper will get +1/+1 as long as an opponent controls any land with the Island land type, not just ones named Island.
- 8 November 2024If you copy a kicked spell on the stack, the copy is also kicked. If the copied spell is a permanent spell, the token the copy of that spell becomes when it enters is also kicked.
- 8 November 2024If a card or token enters as a copy of a permanent, the new permanent isn't kicked, even if the original was.
- 8 November 2024The kicker ability doesn't let you pay a kicker cost more than once.
- 8 November 2024To determine a spell's total cost, start with the mana cost (or an alternative cost if another card's effect allows you to pay one instead), add any cost increases (such as kicker), then apply any cost reductions. The spell's mana value remains unchanged, no matter what the total cost to cast it was.
- 8 November 2024If you put a permanent with a kicker ability onto the battlefield without casting it, you can't kick it.
- 8 November 2024If a spell's kicker cost was paid, the spell is "kicked."