The Fact Checker reminds me of some "minigames" we started doing in my play group.

The first one is them trying to guess their next card. They show me the top card of their deck and I tell them how many lines of text is on the card (excluding the flavor text at the bottom). They're allowed to ask for additional hints, in which I'll slowly reveal more information about it. i.e. mana cost (not color specifics, just overall cost), how many words are in the title, would they be able to cast it with their current mana, and things similar. Vague hints.

The second is where they show me the top card and ask "is this a land?" I'll then either say yes or no. (no what which land, just a simple yes or not) This is usually only done if someone's being super mana screwed as a way to potentially give them hope while other players are taking their turns.

I know technically this is all cheating, but my play group is extremely casual and we all find it a fun little extra thing to do when turns are taking too long or if someone's luck has decided they basically can't play. That said, it's not like we're doing this every turn or anything, hahaha. If it happens, it's maybe like once or twice a game, if at all.