When casting a spell as an Omen, use the alternative characteristics and ignore all of the card's normal characteristics
This opens up a lot of combo options in Commander, with turning into Moltensteel Dragon, pumping him up, then becoming Skithiryx, the Blight Dragon being a particular favorite among many players
Mono-Red +3 Extinction Event +1 Lullmage's Domination +1 Bloodchief's Thirst +1 Essence Scatter -4 Merfolk Windrobber -1 Into the Story -1 Mystical Dispute I keep Ruin Crab over Windrobber because an 0/3 is a good source of life gain after I fill the opponent's graveyard
Upgrade 10 The last card I am adding also works with the +1/+1 counters theme
So yeah, The First Doctor is going to be a cascade deck, and if you like Planechase cards, you can planeswalk too
If your opponent has an oppressive artifact or enchantment, knock it out and cycle Kogla and Yidaro into your library, and hopefully you'll see the ape dinosaur turtle again soon