Since you can't run Lord of ExtinctionLord of Extinction, Consuming AberrationConsuming Aberration is probably the best option for this kind of card, still featured in 88% of Phenax decks on EDHREC today
Vizier of Tumbling Sands cycling ability is actually mana-positive when you untap a Lotus Field with it, which is probably where most copies of this human cleric will be found nowadays
The Sanji Leader (PRB01-001) with Rush-granting ability has carved out a niche in blue/purple aggressive builds
If you're looking to upgrade Growing Threat, look no further
And, if it makes you happy, you can go crazy with tutors like: Demonic TutorDemonic Tutor, Grim TutorGrim Tutor, and Vampiric TutorVampiric Tutor
Lord of the Unreal is the first one