If you think investing money in the stock market or an IRA is a sure thing in the long term, wait until I tell you about investing in MTG booster boxes
Playing multiplayer
When used in conjunction with cards such as Deceiver Exarch or Kiki, Jiki, Mirror Breaker, Splinter Twin is able to easily go infinite, creating infinite numbers of tokens with haste
In a game of Commander, legendary creatures die all the time, and this card will quickly become too expensive to recast
Whenever a creature with myriad attacks, for each opponent other than defending player, you may create a token copy that's tapped and attacking that player or a planeswalker they control
You could also take it another way and focus on cards such as Finale of Devastation or Green Suns Zenith, which let you put cards into play without casting them