What it does
"Titanic" isn't an official Magic keyword—you're likely thinking of Titania (a legendary Elf creature) or cards with "Titan" in their names, like the Theros Titans or the "Titanic" spells from Theros Beyond Death (e.g., Titanic Growth, The Titan Wars).
If you mean Titanic Growth, it's a simple combat trick: it gives a creature +4/+4 until end of turn. The nuance players forget is that pump spells don't grant trample, so a +4/+4 blocker won't push extra damage through—and the buff vanishes at cleanup, so it won't survive to your next turn.
In Commander, raw pump spells like this are generally weak because they're card disadvantage in a 40-life, multiplayer format. If you meant a specific card with "Titanic" in its name, let me know and I'll give you the precise rules breakdown.
Iconic cards with Titanic
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