Best Red Card: Etali, Primal Conqueror Etali, Primal Conqueror is technically a Gruul creature with green identity, too, but considering that you need red mana to cast it face up, I am listing it as my favourite red card
You can use the loyalty ability immediately, and keep it as long as your Dragonlord is around to keep it Seduced with Power
Especially when Alesha gets larger, and the mana cost available grows in tandem, giving all creatures infinite lives as long as the player keeps attacking
If you like consistency, pop Goblin Matron in your goblin decks
Though playing it doesnt net you any cards beyond its replacement, your hand can end up with three new cards it if two you already had are placed on top of your library