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Sure, here are 50 hashtag ideas related to MrBeast challenge videos:

1. #MrBeastChallenge
2. #BeastModeChallenge
3. #UltimateChallenge
4. #MrBeastVideo
5. #CrazyChallenge
6. #ChallengeAccepted
7. #EpicChallenge
8. #MrBeastGivesBack
9. #CharityChallenge
10. #TeamMrBeast
11. #ChallengeMaster
12. #MrBeastFan
13. #ChallengeTime
14. #ChallengeFun
15. #RecordBreakingChallenge
16. #InspiringChallenge
17. #MindBlowingChallenge
18. #HugeChallenge
19. #BiggestChallengeYet
20. #MrBeastCrew
21. #ChallengeAccepted
22. #ChallengeComplete
23. #AdventurousChallenge
24. #MrBeastAdventures
25. #GameChangingChallenge
26. #MrBeastMagic
27. #ChallengeMania
28. #MrBeastCommunity
29. #ChallengeChampion
30. #MrBeastCreation
31. #MrBeastChallenger
32. #ChallengeFrenzy
33. #MrBeastInspiration
34. #ChallengeWinner
35. #UnbelievableChallenge
36. #MrBeastLegacy
37. #GlobalChallenge
38. #MrBeastEnergy
39. #ChallengeForAll
40. #MrBeastEffect
41. #OneOfAKindChallenge
42. #MrBeastWorld
43. #ChallengeTriumph
44. #MrBeastEpicness
45. #ChallengeGalore
46. #MrBeastInspire
47. #ChallengeForGood
48. #MrBeastAction
49. #ChallengeRoyalty
50. #MrBeastAdventure