Chandra's Familiar

Haste
Whenever a nonland source you control adds
one or more {r} to your mana pool, Chandra's Familiar gets +2/+0 until end of turn. If that source was a Chandra planeswalker, Chandra's Familiar gets +3/+0 and gains first strike instead.
Radha gifted Chandra a Karplusan pup from a
new litter the morning Chandra arrived.