This doesn't inherently mean anything, but another ability on the card will somehow refer to the Mount being saddled
One of the fundamental ideas in the game is card abilities can actually alter the rules of play, allowing players to do things that are not normally expected
Return to Ravnica Blocks Ten Guildleaders Isperia, Supreme Judge Obzedat, Ghost Council Lazav, Dimir Mastermind Trostani, Selesnya's Voice Niv-Mizzet, Dracogenius Borborygmos Enraged Jarad, Golgari Lich Lord Prime Speaker Zegana Aurelia, the Warleader Rakdos, Lord of Riots Its impossible to talk about cycles without mentioning Ravnica sets, which are usually built upon 10-card cycles featuring Ravnica's ten guilds, from lands to mana rocks and creatures
In a format where words like redundancy or synergy get thrown around a lot, its quite weird that this one isnt on people's minds when building for hand knowledge