With each Magic: The Gathering set, the card slots of Playbooster packs change slightly. Here's what you can expect from the Modern Horizon 3 booster packs and the pull rate percentages.
Modern Horizons 3 Play Boosters – NICE PULLS!
Playable in both Draft and Sealed, MH3 Magic: the Gathering Playbooster packs include a slot for new Modern cards that were previously Eternal, or just Commander cards. A Wildcard slot has been added, which can hold any rarity card with a treatment like Retro Frame, Borderless Frame Break, and even a Snow-Covered Waste basic land.
Special Guest cards can appear in a Common rarity slot. The eight Commander MH3 cards can appear in the Wildcard slot and are likely unplayable in Draft and Sealed games. Here's what a Modern Horizons 3 Playbooster might contain, according to WotC.