Ember Weaver 
Creature — Spider
Reach (This creature can block creatures with flying.) As long as you control a red permanent, this creature gets +1/+0 and has first strike.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL