Heightened Reflexes
{R}
Instant
Target creature gets +1/+0 until end of turn. Put a first strike counter on it.
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.