Mario Kart 8 Deluxe DLC Wave 4 Adds Birdo, Yoshi's Island - Siliconera

Nintendo introduced Wave 4 of the Mario Kart 8 Deluxe DLC Booster Course Pass, and a new track based on Yoshi's Island and Birdo will arrive.

Mario Kart 8 Deluxe DLC Wave 4 All Courses 150cc + Birdo Gameplay

Mario Kart 8 Deluxe – Booster Course Pass, ST, Doubled Dash!! [WAVE 6 AVAILABLE NOW], Page 95

Mario Kart 8 - Wikipedia

Mario Kart 8 Switch DLC with Birdo, Yoshi's Island gets a release date - Polygon

Mario Kart 8 Deluxe Wave 4 DLC Release Date Set, Courses Shared

Mario Kart 8 Deluxe Booster Course Pass Wave 4 Is Yoshi's Island

Mario Kart 8 - Wikipedia

REACTING TO BIRDO AND YOSHI'S ISLAND IN MARIO KART 8 DELUXE (BOOSTER COURSE PASS WAVE 4 REACTION)

Mario Kart 8 Deluxe's fourth wave of DLC revealed: Yoshi's Island and Birdo is back - Dexerto

First Look at Yoshi's Island (Full Race) & Birdo in Mario Kart 8 Deluxe Booster Pass Wave 4 DLC

Mario Kart 8 - Wikipedia

Mario Kart 8 Deluxe Booster Course Pass Wave 4 Trailer