Guardian Sunmare
Creature — Horse Mount
Ward 
Whenever this creature attacks while saddled, search your library for a nonland permanent card with mana value 3 or less, put it onto the battlefield, then shuffle.
Saddle 4
It'll satisfy your need for steed!
Wojtek Łebski
Aetherdrift (DFT)
• #533Rulings
“Saddled” isn’t an ability that a creature has. It’s just something true about that creature. It won’t stop being saddled until the turn ends or it leaves the battlefield.
(wotc • 2025-02-07)
You may activate a permanent’s saddle ability even if that permanent is already saddled.
(wotc • 2025-02-07)
“Saddle N” means “Tap any number of other untapped creatures you control with total power N or greater: This permanent becomes saddled until end of turn. Activate only as a sorcery.”
(wotc • 2025-02-07)
If a permanent becomes a copy of a saddled Mount, the copy won’t be saddled.
(wotc • 2025-02-07)
Creatures with saddle can attack or block as normal even if they aren’t saddled.
(wotc • 2025-02-07)
An ability that triggers when a creature “attacks while saddled” will trigger only if that creature was saddled when it was declared as an attacker.
(wotc • 2025-02-07)
Rulings
“Saddled” isn’t an ability that a creature has. It’s just something true about that creature. It won’t stop being saddled until the turn ends or it leaves the battlefield.
(wotc • 2025-02-07)
You may activate a permanent’s saddle ability even if that permanent is already saddled.
(wotc • 2025-02-07)
“Saddle N” means “Tap any number of other untapped creatures you control with total power N or greater: This permanent becomes saddled until end of turn. Activate only as a sorcery.”
(wotc • 2025-02-07)
If a permanent becomes a copy of a saddled Mount, the copy won’t be saddled.
(wotc • 2025-02-07)
Creatures with saddle can attack or block as normal even if they aren’t saddled.
(wotc • 2025-02-07)
An ability that triggers when a creature “attacks while saddled” will trigger only if that creature was saddled when it was declared as an attacker.
(wotc • 2025-02-07)