Akroma's Memorial? Costs quite a lot of mana, but grants a whole suite of useful abilities.
Concerted Effort or Odric, Lunarch Marshal let your creatures share abilities (from a select list). So if you have one creature with trample, all of them will get it for the turn, etc.
Power Matrix, if you are allowed to use pre-Modern cards.
If you just looking for granting one of the abilities, there are too many cards to list for that in w/g. Use the gatherer (advanced search) or some other card search engine to browse through those.
Concerted Effort or Odric, Lunarch Marshal let your creatures share abilities (from a select list). So if you have one creature with trample, all of them will get it for the turn, etc.
Power Matrix, if you are allowed to use pre-Modern cards.
If you just looking for granting one of the abilities, there are too many cards to list for that in w/g. Use the gatherer (advanced search) or some other card search engine to browse through those.
Former Rules Advisor
"Everything's better with pirates." - Lodge
(The Gamers: Dorkness Rising)
"Any sufficiently analyzed magic is indistinguishable from science."
(Girl Genius - Fairy Tale Theater Break - Cinderella, end of volume 8)
Currently Playing:
Multiplayer EDH Lists (click italics for a link to the thread!)
[Primer] Lord of Tresserhorn - Don't Tell Me What I Can't Do[Primer] Roon of the Hidden Realm - Rhino Blink
5 Color Tribal Guide (Slivers, Atogs, Allies, Spirits)
Also Playing (most decklists can be found on my profile)
MarathGeistKamahlGrenzoBolasThassaGitrog
PiratesZurVial Smasher&ThrasiosYennettJhoira(cEDH)Strix(Pauper)
Legacy: Maverick
Modern:
Melira PodRIP 1/19/15GWHatebears