Cait, Cage Brawler A mostly indestructible commander that grows provides lots of interesting Voltron potential
Its a reasonably straightforward mechanic with the odd second thing gets the trigger idea used in the second card drawn ability introduced in War of the Spark on Jace, Arcane Strategist but fleshed out on seven cards in the next premiere set, Throne of Eldraine
With so many cards that generate or synergize with Treasures, its easy to get an instant benefit out of your Goldspan friend
This costs two more mana than that
If the card's mana value is 4 or greater, repeat this process
Now, there may be some debate as to whether this is, in fact, a version of Titan, as his name isn't directly usedyou summon Fenrir who then, in turn, summons Titan (AKA a summonception)