rainbow pokemon trainer cards - Iscan 207/196 Lost Origin - Full Art Chilling Reign Avery (Secret) Secret Rare Trainer Cards

The two Orbs add either one red or one green mana respectively, and when you use that mana to cast a Dragon creature, it gains either haste or a +1/+1 counter and hexproof for a turn

A slow or clunky mana base is the number one reason budget decks fail

You can also spend 12 Wonder Hourglasses to recover 1 Wonder Stamina if you dont want to wait

(Big Furry Monster) and Infinity Elemental definitely exist in spirit of one-hit kills

A great example of this strategy is the Toxtricity card from the Darkness Ablaze expansion

And while there are some legendary creatures that can be alternatively cast for a non-creature half, that seems like a lot of hoops to jump through to then give all your creatures what you actually wanted two turns later