Momentum Rumbler
{3}{R}
Creature -- Dinosaur
3/3
Whenever ~this~ attacks, if it doesn't have first strike, put a first strike counter on it.
Whenever ~this~ attacks, if it has first strike, it gains double strike until end of turn.
Rafiq of the Many
{1}{G}{W}{U}
Legendary Creature -- Human Knight
3/3
Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
Whenever a creature you control attacks alone, it gains double strike until end of turn.