While these cards play best in 3-color decks, they work in 2-color lists, offering cheap acceleration that applies to most cards in a given list
Tricky, and certainly possible to break up, but this agent has high potential
To determine whether the target creature gets +3/+0, look at its creature types after you've gained control of it, untapped it, and given it haste
The cost to play it is also rather small thanks to its low mana value
The real reason red has long felt like an incomplete color in Commander is that it never really had many tools if you wanted to travel that second route
If the creature you don't control is an illegal target as Signature Slam tries to resolve but the creature you control is a legal target, you'll still put a +1/+1 counter on the target creature you control