Last up is Merchant of the Vale , a 2/3 from the Throne of Eldraine set
The Indoraptor has a bunch of abilities, entering the battlefield stronger if your opponents have taken damage this turn thanks to its Bloodthirst ability
Sorin of House Markov might start as a two-mana creature but can flip super easily to the much more powerful Planeswalker side after you gain a measly three life
Needing to play against blue or black opponents is a bit restrictive, but this card punches well above its weight as a cheap, interactive 2-for-1
Altar of Dementia can be combined with the buffed goblins that can be mass-created with Krenko, Ashnods Altar generates two colorless mana for each sacrificed creature, as does Sol Ring
On top of that, its a flying creature thats capable of being pumped with power to go on the offensive later on