In removal-heavy matchups, it can be better to try to wait and play Tergrid, God of Fright when we have enough mana to follow it up immediately with a discard spell so we get at least some value out of it, even if it gets killed
P/T Number 392 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Timeless, Vintage Not Legal Formats Alchemy, Pauper, Standard Rulings (2/18/2022) An Aura controlled by an opponent does not cause a creature you control to be modified
Here are some things you can do at instant speed with ten mana on Turn 5, even ignoring any kind of Growth Spiral/Gift of Paradise starts: Electrodominance their face for 8 and then cast a free Star of Extinction/Emergency Powers/Brasss Bounty/Overflowing Insight/Pelakka Wurm/Nexus of Fate
Playable for only the cost of two ink, and capable of questing for three lore, Simba is going to be a huge book for Ruby aggro decks
They do not include any enchantments that may have been placed on the creature