Risen Riptide — ruling 1

Risen Riptide’s ability overwrites any previous effects that set its power and/or toughness to specific values. Other effects that set these characteristics to specific values that start to apply after the ability resolves will overwrite that part of the effect.

Risen Riptide — ruling 2

Effects that modify Risen Riptide’s power or toughness without setting it will apply to its new base power and toughness no matter when they started to take effect. The same is true for counters that change the creature’s power or toughness.

Risen Riptide : règles, fonctionnement et interactions (MTG)

Risen Riptide is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Whenever you cast a kicked spell, this creature has base power and toughness 5/5 until end of turn.

How it works : Risen Riptide

Original English text — Wizards of the Coast / Scryfall

#1September 25, 2020· Wizards of the Coast
Risen Riptide’s ability overwrites any previous effects that set its power and/or toughness to specific values. Other effects that set these characteristics to specific values that start to apply after the ability resolves will overwrite that part of the effect.
No other card is named in this ruling.
#2September 25, 2020· Wizards of the Coast
Effects that modify Risen Riptide’s power or toughness without setting it will apply to its new base power and toughness no matter when they started to take effect. The same is true for counters that change the creature’s power or toughness.
No other card is named in this ruling.